weak
adjective
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deficient in intelligence or mental power“a weak mind”
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overly dilutedwashy
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likely to fail under stress or pressure“the weak link in the chain”
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wanting in moral strength, courage, or willfrailfallibleimperfect
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deficient in magnitudefaint
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not having authority, political strength, or governing power“a weak president”
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concerning verbs, having standard inflection“The majority of verbs are weak verbs.”
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lacking bodily or muscular strength or vitalityweakly
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deficient or lacking in some skill“he's weak in spelling”
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pronounced with little or no stress, referring to vowels or syllables“A line in iambic pentameter has five weak syllables.”light
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wanting in physical strength“a weak pillar”
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tending downward in price“a weak market for oil stocks”