Antonyms for the word "un-offensive" include offensive, objectionable, distasteful, provocative, unpleasant, and irritating. These words are often used to describe behavior, speech, or actions that are hurtful or disrespectful to others. Offensive behavior can be a result of cultural, social, or personal values and beliefs. It is essential to be aware of the things we say or do that could potentially cause offense to others. Using these antonyms can help us understand the implications of our actions, and we can learn to be more considerate and respectful towards others, especially those who may have different beliefs or cultures.