Uncontemplated is a word that describes an action or thought that was not given any prior consideration or thought. Synonymous words for uncontemplated include unplanned, impulsive, unforeseen, spontaneous, unexpected, undetermined, unanticipated, sudden, impromptu, rash. These words all describe a situation or decision that was made quickly without being thought through. Other synonyms for uncontemplated are hasty, uninformed, unpremeditated, unthought-of, automatic, unexpected, instantaneous, unexamined, uncalculated, accidental. These synonyms for uncontemplated all convey a sense of impulsivity or thoughtlessness. They describe a situation that was not planned or thought about beforehand, resulting in unexpected outcomes.