Done without deliberation or forethought; unpremeditated(adjective)
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Use "indeliberate" in a sentence
"Whether this was a strategy of psychologic warfare, designed to keep down the Nigerians' capacity to critically analyse their ways and actions (many revelled at being dubbed the happiest while actually they weren't happier than anyones), or an indeliberate missing of the correct mark, it is difficult to tell."
"When the family that is supposed to aid the growth and development of a child are the same ones taunting the child, through deliberate or indeliberate abuse (abnormal use), it would have to take a miracle for that child to survive and eventually overcome his life's obstacles to becoming a grown man."
"Preventing grace must, according to its physical nature consist in unfree, indeliberate vital acts of the soul; co-operating grace, on the contrary, solely in free, deliberate actions of the will."