weakness

(noun) a flaw or weak point. Synonyms: failing. Example: "He was quick to point out his wife's failings."

(noun) powerlessness revealed by an inability to act. Synonyms: helplessness, impuissance. Example: "In spite of their weakness the group remains active."

(noun) the property of lacking physical or mental strength; liability to failure under pressure or stress or strain. Examples: "His weakness increased as he became older." "The weakness of the span was overlooked until it collapsed."

(noun) the condition of being financially weak. Example: "The weakness of the dollar against the yen."

(noun) a penchant for something even though it might not be good for you. Example: "He has a weakness for chocolate."