Weak-sister definition

(slang) One who is cowardly, unreliable, etc.
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An ineffective or undependable member of a group.
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A person regarded as timid or indecisive.
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(chiefly US, idiomatic, derogatory) A person who is cowardly or indecisive.
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(chiefly US, idiomatic) A person or thing which is the least robust or least dependable member of a group.
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Other Word Forms

Noun

Singular:
weak-sister
Plural:
weak-sisters