Lacking courage, spirit, or energy; timid, faint-hearted; lazy, negligent. Now English regional (chiefly northern).

Lacking intellectual or moral strength.

Easily influenced or swayed; having little power of resistance to the influence of other persons or things; compliant; impressionable.

Wanting in moral strength for endurance or resistance; lacking fortitude or courage, strength of purpose or will; unsteadfast, wavering.

Of persons, with reference to the mind: Not firm or strong in character or purpose; weak, frail, irresolute. Also of the mind, judgement, etc.

figurative. Weak, feeble. Obsolete.

Destitute or devoid of a head or heading, in various senses.

Lacking courage, boldness, or mettle.

Weak, impotent; insipid, bland, characterless. rare before 19th cent.

Wanting in resolution or decision of character; infirm of purpose; vacillating; characterized by irresolution.

Having no marrow; (figurative) lacking substance, essence, or spirit.

Capable of being seduced or led astray.

(un-, prefix1 affix 1.)

Weak, fragile; unreliable, ineffectual. Obsolete.

Capable of being swayed or influenced.

lacking forbearance or perseverance.

Lacking strength of mind or purpose.

Not having an independent will; not exercising one's own will. Also: not involving exercise of a person's will.

tiffany-trader, etc.

Having a weak mind; lacking strength of purpose. Of actions, opinions, etc.: Indicating weakness of mind.

Slack; not tense, rigid, or tight. Hence of bodily constitution or mental powers: Wanting in ‘tone’ or tension. Now somewhat rare.

lax-fibred, lax-flowered adjs.

Botany. Of a leaf, etc.: having no apparent veins or ribs.

figurative. Feeble or poor in quality or character; trifling, unsubstantial, trashy, ‘milk-and-watery’. †Also rarely as int. = pish! tush!

Weak, feeble, exhausted. Obsolete.

figurative. Likened to a mollusc; flabby, spineless. Now rare.

figurative. Lacking substance, solidity, or strength; (of a person) having little strength of character or willpower; lacking ‘backbone’.

colloquial. Cf. weed, n.1 9. With reference to a person's physique: tall and thin, esp. extremely or unhealthily so; lanky and lacking in physical…

stupid; easily manipulated.

Of language, character, etc.: Weak, wanting ‘back-bone’; nerveless, feeble.

Having weak knees; chiefly figurative wanting in resolution or determination.

Without fibres or fibre; without strength, nerveless.

figurative. Lacking courage, vigour, resolve, or strength of character; feeble, spineless.

Without the firmness of character held to be expressed by a prominent chin. Esp. in chinless wonder.

Destitute of backbone or strength of character.

= feather-weighted adj. participial adjective; weak.

Lacking moral force, resolution, or vigour; marked by weakness or instability of character; feeble, flabby, irresolute.

yielding, ‘weak-kneed’.

Exhibiting or characterized by lack of restraint or weakness of will. Also: characterized by the tendency to act against one's better judgement.

figurative. Of persons in an intellectual sense, of systems, etc.: That has exhausted its vigour and energy; incapable of efficient action. Also…

appositive or as adj. Weak, feeble.

Also gutsless. Lacking in energy, courage, or determination.

Like a willow; fig. of a pliant character. rare.

Timid, feeble, ineffectual; insipid, wishy-washy.

Involving or characterized by a nanny or nannies; that has been looked after by a nanny or nannies; treated in a nannyish manner.

slang (chiefly U.S.). Of a male: having no testicles (rare); (chiefly in extended use) unmanly; weak, lacking in nerve. Cf. gutless, adj. 2.