This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. One of weak constitution or character.

adj. weak, either physically, morally or mentally

n. A person of weak or even sickly physical constitution

n. A person of weak character, lacking in courage and/or moral strength.

n. A weak or feeble creature.

adj. Weak; feeble.

n. A feeble creature.

Feeble; weak.

n. a person who is physically weak and ineffectual

"To call a weakling strong, a fool wise, a short man tall, a black man white, a sinner holy,—is, believe me, not praise but contumely."

athlete   

person    mortal    individual    someone    soul    somebody   

chicken    namby-pamby    softy    softie    crybaby    WIMP   

weak    feeble    jellyfish    squab    walk-over    sissy   

poltroon    coward    hypocrite    braggart    simpleton    cad    sneak    boaster    slanderer    ignoramus