Synonyms for Weak:

adj.

cowardly (adjective)
impotent, indecisive, ineffectual, insecure, nerveless, nervous, palsied, shrinking, soft, spineless, unstable, unsure, vacillating, wimpy, wishy-washy.
deficient (adjective)
incomplete.
deficient, feeble (adjective)
flabby, green, handicapped, immature, implausible, improbable, inadequate, incompetent, incomplete, inconceivable, incredible, ineffective, lame, limited, raw, unbelievable, unconvincing, untrained.
dilute (adjective)
Waterish.
diluted (adjective)
thin, watered-down.
disabled (adjective)
incapacitated.
enervated (adjective)
enervated, limp.
exposed, vulnerable (adjective)
assailable, helpless.
faint, soft (adjective)
dull, imperceptible, inaudible, low, muffled, pale, poor, slight, small, thin, unaccented, unstressed, whispered.
feckless (adjective)
ineffective.
feeble (adjective)
ailing, debilitated, decrepit, doddering, faint, feeble, flimsy, fragile, frail, infirm, powerless, rickety, sickly, soft, run down.
foolish (adjective)
Weak-minded.
helpless (adjective)
helpless.
impotent (adjective)
disabled, impotent, inadequate, incapable, incompetent, feeble, forceless, powerless.
irresolute (adjective)
ambivalent, capricious, changeable, erratic, fickle, fly-by-night, halfhearted, hesitant, impulsive, inconsistent, indecisive, insipid, irresolute, irresponsible, shifty, shrinking, shy, spineless, tentative, uncertain, undecided, undependable, unresolved, unsure, unwilling, vacillating, volatile, watery, yellow, Flitting, Shilly-shally, dillydallying, double-minded, infirm.
not strong (adjective)
anemic, debilitated, decrepit, enervated, exhausted, faint, feeble, flaccid, flimsy, forceless, fragile, frail, hesitant, infirm, insubstantial, irresolute, limp, makeshift, powerless, puny, rickety, rotten, senile, sickly, uncertain, undependable, unsound, unsteady, unsubstantial, wasted, weakened, weakly.
soft (adjective)
weak-willed.
tasteless (adjective)
banal, bland, flat, flavorless, jejune, mild, milquetoast, plain, savorless, stale, tasteless, unsavory, vapid, insipid.
tottery (adjective)
tottery.
useless (adjective)
ineffectual.
washy (adjective)
washy.
watered-down (adjective)
dilute, diluted, insipid, tasteless, washy, watery, Waterish.
weak (adjective)
anemic, impotent, debilitated, feeble, frail, infirm, powerless.
weary (adjective)
apathetic, blue, bored, cheerless, depressed, droopy, drowsy, exhausted, fatigued, flaccid, footsore, limp, listless, sleepy, tired, toilsome, trying, uphill, wasted, weary, worn-out, Wayworn, Frazzled, over-weary, debilitated, faint, feeble, run down.
wishy-washy (adjective)
wishy-washy.

n.

absolute, absolutist, autonomous, bicameral, collectivist, colonialist, democratic, federal, flabby, governing, governmental, healthy, senile, sick, strong. abstract, brittle, central, conceptual, deterministic, makeshift, metaphysical, nonconformist, orthodox, popular, ramshackle, rotten, sleazy, theoretical, tottery, unsteady, unsubstantial, utopian, tumbledown. bad, brave, courageous, dire, disgraceful, embarrassing, low-grade, nervous, palsied, pitiful, poor, second-rate, terrible, unstrung, Weak-minded. active, causative, continuous, dull, future, imperative, impersonal, inaudible, intransitive, loud, low, muffled, whispered, ergative. acutely, affective, assailable, basic, bitter, blind, burning, casual, deep, deep-seated, depth, exposed, ineffective, ineffectual, limited, paltry, small, undisciplined, unorganized, untrained. affricate, alveolar, aspirate, aspiration, assonance, backward, bilabial, consonant, experienced, expert, fresh, green, handicapped, immature, incomplete, insecure, raw, trained, young, close vowel, closed syllable. aggregate, bullish, buoyant, capitalist, deflationary, economic, economically, insubstantial, unsound, antigrowth. alcoholic, black, carbonated, corked, drinkable, dry, effervescent, full-bodied, decaffeinated. bankable, change, debut, evergreen, guest, interpretative, interpretive, live, precarious, tottering, unstable, all-star, off-screen. ability, malnourished. baby-faced, chiseled, craggy, fine, full-face, furrowed, good-looking, handsome, Waterish, watered-down, fresh-faced, hatchet-faced. blurred, fuzzy, imperceptible, implausible, improbable, inconceivable, inconspicuous, incredible, invisible, likely, subtle, unbelievable, unconvincing, Unconceivable. breakable, crumbly, friable, delicately balanced. exclusive, finite, limiting, prohibitive, restricted, restrictive, specific, under control, within limits. directionless, gutless, lame duck, susceptible, weak-willed, be easily led. weak (noun)
adynamic, anaemic, anemic, asthenic, breakaway, debilitated, decrepit, dilute, diluted, effeminate, enervated, engulfed, faint, fallible, feeble, flaccid, flimsy, flooded, forceless, fragile, frail, helpless, human, imperfect, impotent, incapacitated, infirm, inundated, jerry-built, lame, lax, light, limp, low-powered, namby-pamby, nerveless, overcome, overpowered, overwhelmed, pale, pallid, powerless, puny, regular, sapless, shoddy, slack, slight, soft, spineless, swamped, tenuous, thin, unaccented, unforceful, unstressed, vulnerable, wan, washy, watery, weakened, weakly, wimpish, wimpy, wishy-washy.

v.

disabled (verb)
palsied.

Other synonyms:

crumbly, directionless, friable, ineffective, ramshackle, strong, unconvincing, Unconceivable, Waterish, watered-down. implausible, incredible, insecure, lame duck, rotten, tottering, tottery. brittle, improbable, inconceivable, poor, precarious, susceptible, unbelievable, unstable, unsteady, unsubstantial. ineffectual. dull. faint
low.
flimsy
insubstantial.
fragile
breakable.
helpless
helpless.
ill
sick.
insecure
unsound.
lame
lame.
unnerved
unstrung.
vulnerable
assailable, vulnerable.
Other relevant words:
finite, ineffectual, insubstantial, lame, lax, light, low, pale, poor, puny, slack, slight, small, thin, unaccented, unsound, unstressed, unsubstantial, washy, weakly, wishy-washy, weak-willed.

Usage examples for weak

  1. He thought of how strong had been his influence over other women, and how weak he had always been in Helen's hands. – With Edge Tools by Hobart Chatfield-Taylor
  2. " I've been weak Alma; I don't deny it. – The Vertical City by Fannie Hurst
  3. She did not understand, and was not weak enough to ask questions. – Lodusky by Frances Hodgson Burnett