1. likely to fail or make errors - everyone is fallible to some degree • Ant: infallible • Similar to: errant, erring, error-prone, undependable, unreliable, weak • Derivationally related forms: fallibility 2. wanting in moral strength, courage, or will; having the attributes of man as opposed to e.g. divine beings - I'm only a fallible human - frail humanity • Syn: frail, imperfect, weak • Similar to: human • Derivationally related forms: imperfectness (for: imperfect)