untactful a lacking or showing a lack of what is fitting and considerate in dealing with others Usage(s) To counteract untactful Attorney Vails. It seemed untactful to ask what the secret police were doing in a library. In spite of the untactful use of the word "exploitation," the Philippines voted in a plebiscite last week (March 11) to amend the Constitution as Washington wanted. Synonym(s) tactless Antonym(s) tactful