noun
a person, especially a man, regarded as being weak and feeble
adjective
describing someone as weak or feeble
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The teacher scolded the student for being a pantywaist and not standing up for what he believed in.
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I can't believe you're being such a pantywaist about going on the roller coaster.
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Don't be such a pantywaist, just go talk to her.
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He was considered a pantywaist in the world of competitive sports due to his lack of aggression.