If you describe someone as tactless, you think what they say or do is likely to offend other people. He had alienated many people with his tactless remarks. tactful. likely to upset or embarrass someone without intending to tactful
having no tact; unaware or intentionally inconsiderate of someone elses feelings
showing skill in handling difficult situations lacking or showing a lack of what is fitting and considerate in dealing with others; "in the circumstances it was tactless to ask her age