Thesaurus.com
Dictionary.com
Definitions

locked-in

ADJECTIVE
booked
Synonyms
STRONGEST
contracted engaged reserved
STRONG
billed slated
WEAK
lined up
Antonyms
WEAK
free liberated
ADJECTIVE
enclosed
Synonyms
STRONGEST
confined
STRONG
buried contained embedded encased enfolded immured implanted imprisoned included inserted interred jailed
WEAK
packed up penned in shut up stuffed in wrapped-up
ADJECTIVE
hardheaded
Synonyms
STRONGEST
astute hard-headed hard-nosed headstrong obstinate practical pragmatic rational sensible shrewd sober unsentimental
WEAK
bullheaded cool hang-tough hard hard-boiled intractable level-headed mulish pertinacious perverse pigheaded realistic resolute standpat tough unyielding willful
Antonyms
STRONGEST
irrational stupid submissive unrealistic unreasonable
WEAK
yielding
ADJECTIVE
hard-nosed/hardheaded
Synonyms
WEAK
astute bullheaded hard hard-boiled headstrong intractable levelheaded mulish obstinate pertinacious perverse pigheaded practical pragmatic rational realistic resolute sensible shrewd sober standpat tough unsentimental unyielding willful
Antonyms
WEAK
easy easygoing laid-back merciful
ADJECTIVE
headstrong
Synonyms
STRONGEST
impulsive
WEAK
bullheaded contrary determined foolhardy froward hard-core hard-nosed hard-shell heedless imprudent intractable mulish murder obstinate perverse pig-headed rash reckless refractory self-willed strong-minded uncontrollable ungovernable unruly unyielding willful
Antonyms
WEAK
calm docile moderate obedient submissive tolerant
ADJECTIVE
immovable
Synonyms
STRONGEST
immobile immutable impassive inflexible motionless stationary steadfast uncompromising unshakable unyielding
STRONG
adamant constant fast firm set solid stable
WEAK
dead set on dug in hard-nosed immotile intransigent obdurate quiescent resolute rooted secure set in concrete set in stone standpat stick to guns stuck unalterable unchangeable unmodifiable unwavering
Antonyms
STRONGEST
flexible mobile moving unfixed willing yielding
STRONG
changeable inconstant indefinite loose movable soft supple undecided unstable untrustworthy wavering
ADJECTIVE
inexorable
Synonyms
STRONGEST
implacable inescapable merciless relentless unrelenting
WEAK
adamant adamantine bound bound and determined compulsory dead set on dogged hard harsh hell bent on immobile immovable ineluctable inflexible ironclad like death and taxes mean business necessary no going back obdurate obstinate remorseless resolute rigid set in stone severe single-minded stubborn unappeasable unbending uncompromising unmovable unyielding
Antonyms
STRONGEST
kind merciful nice sympathetic
WEAK
flexible lenient remorseful yielding
ADJECTIVE
intractable
Synonyms
STRONGEST
incurable intransigent stubborn uncompromising unmanageable
WEAK
awkward bull-headed cantankerous contrary fractious hang-tough hard-line headstrong immovable incompliant indocile indomitable insoluble locked mulish obdurate obstinate pat pertinacious perverse pig-headed recalcitrant refractory resolute self-willed tenacious tough unbending uncooperative undisciplined ungovernable unpliable unruly unyielding wayward wild willful
Antonyms
STRONGEST
willing
WEAK
manageable
ADJECTIVE
intractable/intransigent
Synonyms
WEAK
awkward bullheaded cantankerous contrary hang-tough hard-line headstrong immovable incompliant incurable indocile indomitable insoluble mulish obdurate obstinate pat pertinacious perverse pigheaded recalcitrant refractory resolute self-willed set in stone tenacious tough unbending uncompromising uncooperative undisciplined ungovernable unmanageable unpliable unruly unyielding wayward wild willful
Antonyms
WEAK
amenable easy facile manageable
ADJECTIVE
obstinate
Synonyms
STRONGEST
adamant dogmatic headstrong inflexible intransigent recalcitrant steadfast tenacious unyielding willful
STRONG
convinced dogged firm hardened resolved
WEAK
cantankerous contradictory contrary contumacious dead set on hard heady immovable indomitable intractable mulish obdurate opinionated opinionative persistent pertinacious perverse pigheaded refractory relentless restive self-willed strong-minded unalterable unflinching unmanageable
Antonyms
STRONGEST
amenable flexible obedient pliant soft submissive surrendering willing yielding
STRONG
irresolute
WEAK
agreeable cooperative helpful
ADJECTIVE
opinionated
Synonyms
STRONGEST
assertive cocky stubborn
WEAK
adamant arbitrary biased bigoted bossy bullheaded cocksure conceited dictatorial doctrinaire dogmatic hard-line high-handed inflexible intransigent obdurate obstinate one-sided oracular overbearing pigheaded positive pragmatic pragmatical prejudiced self-assertive set in stone set on single-minded tilted uncompromising unyielding weighted
Antonyms
STRONGEST
shy
WEAK
compromising indifferent open-minded
ADJECTIVE
rigid
Synonyms
STRONGEST
adamant austere definite exact fixed hard-line harsh inflexible intransigent rigorous solid stern stringent uncompromising unyielding
WEAK
adamantine bullheaded changeless chiseled dead set determined firm hard incompliant inelastic inexorable invariable obdurate set set in stone single-minded static strait-laced unalterable unbending unbreakable unchanging undeviating unmoving unpermissive unrelenting
Antonyms
STRONGEST
broken easy flexible gentle imprecise indefinite inexact irresolute lenient mild pliant soft tolerant unfixed unreliable willing yielding
WEAK
bending limber pliable
ADJECTIVE
set
Synonyms
STRONG
agreed appointed arranged bent concluded confirmed determined entrenched established firm fixed immovable intent ironclad obstinate pat prearranged predetermined prescribed regular resolved rooted scheduled settled specified stated stipulated
WEAK
certain customary dead set on decisive definite hanging tough inveterate pigheaded resolute rigid set in stone solid as a rock steadfast stiff-necked stubborn unflappable usual well-set
Antonyms
STRONG
changeable indefinite irresolute undecided unsettled variable wavering weak yielding
ADJECTIVE
unbending
Synonyms
STRONG
crisp firm obstinate reserved
WEAK
aloof distant do-or-die dug in formal hard as nails hard-line hold one's ground hold the fort hold the line incompliant inelastic inexorable inflexible intractable obdurate relentless resolute set in stone severe single-minded standing one's ground standing pat sticking to one's guns stiff strict stubborn uncompromising unflexible unrelenting unswayable unyielding uptight
Antonyms
STRONG
flexible soft yielding
WEAK
bending pliable pliant relaxed
ADJECTIVE
unyielding
Synonyms
STRONGEST
adamant determined hard-line hard-nosed immovable implacable inflexible intractable merciless obstinate relentless rigid ruthless single-minded staunch stubborn uncompromising unrelenting unwavering
WEAK
dead set on firm fixed hang-tough hard hard-core hardheaded headstrong immalleable impliable inexorable mulish obdurate pertinacious pigheaded refractory solid stiff stiff-necked tough unbending uncompliant unmovable unswayable
Antonyms
STRONGEST
compassionate cooperative flexible giving irresolute kind merciful nice pliable pliant soft submissive sympathetic wavering weak willing yielding
WEAK
surrendering

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

One type of atom remains locked in place within a crystal structure, while another type moves freely through it.

From Science Daily • Apr. 21, 2026

It then hid under a shelf and got locked in overnight before helping itself to some dog food and bird seed for breakfast and knocking stock around the store.

From BBC • Apr. 18, 2026

The two companies are the dominant players in the theme-park industry, locked in an increasingly intense battle for Orlando following Comcast’s opening of Epic Universe in May 2025.

From Barron's • Apr. 15, 2026

For sellers, many have the “golden handcuffs” of low interest rates locked in during the pandemic, so they’re not incentivized to move.

From Los Angeles Times • Apr. 15, 2026

He seems—glimpsed through the flowering bars—a man locked in a strangely gorgeous prison.

From "How the García Girls Lost Their Accents" by Julia Alvarez