liable to mistake

See: fallible
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References in classic literature ?
But, I say we are all liable to mistakes and I should feel sensible of your delicacy, and grateful for it, if you would spare me these references to Harthouse.
The best of us are so liable to mistakes, that even you, Mrs General, have fallen into a little error.
They try outrageous things, which thrills the crowds - but also makes them liable to mistakes at crucial times and places.