As humans we are all fallible, because fallible means likely to make errors or fail. Nobody's perfect, after all.

Fall down on the job and you're fallible. It's a forgiving way to say you screwed up. If a scientific experiment's data is fallible, that means you can't trust the numbers. More than just locking your keys in the car, fallible can allude to a lack of moral strength. If in addition to locking your keys in the car, you kissed your best friend's husband, you might try using "I'm fallible" as your defense.

Definitions of fallible

adj 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, imperfect, weak
having human form or attributes as opposed to those of animals or divine beings

adj likely to fail or make errors

“everyone is fallible to some degree”
straying from the right course or from accepted standards
erring, error-prone
capable of making an error
undependable, unreliable
liable to be erroneous or misleading
likely to fail under stress or pressure
incapable of failure or error
foolproof, unfailing
not liable to failure
inerrable, inerrant, unerring
not liable to error
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