errant
He felt responsible for his child's errancy.
Errancy is more serious than just a tendency to make mistakes.
These beliefs cannot in any way be regarded as evidence of her errancy.
As a fundamentalist Christian, she believes there can be no errancy in the Bible but says that "the only problem is with the errancy of people reading it."

SMART Vocabulary: related words and phrases

Making mistakes
balls
balls (something) up
blunder
blunderingly
bodge
making
misdiagnose
misdiagnosis
misdirect
misdirection
misremember
misrender
misstate
mistake
mistranscribe
stumbling
stumblingly
to err is human (to forgive divine).idiom
trip (someone) up
uncorrectable