1. fallible (vs. infallible), errant, erring, error-prone, undependable, unreliable, weak

usage: likely to fail or make errors; "everyone is fallible to some degree"

2. fallible, frail, imperfect, weak, human (vs. nonhuman)

usage: 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"

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See also: fallible (Dictionary)