Open English Wordnet
Nouns
(n)failing, weaknessa flaw or weak point“he was quick to point out his wife's failings” (n)weaknessthe property of lacking physical or mental strength; liability to failure under pressure or stress or strain“his weakness increased as he became older”,
“the weakness of the span was overlooked until it collapsed” (n)weaknessthe condition of being financially weak“the weakness of the dollar against the yen” (n)weaknessa penchant for something even though it might not be good for you“he has a weakness for chocolate”