Antonyms for the word "unbelligerent" can be easily found by recognizing its meaning which refers to being peaceful, non-aggressive or not hostile. The opposite term for unbelligerent is belligerent, which means aggressive, hostile, or warlike. In addition, words such as combative, pugnacious, and bellicose can also be used as antonyms for unbelligerent, to indicate someone who is quarrelsome or fond of fighting. Meanwhile, synonyms for unbelligerent include pacifist, peaceful, conciliatory, and non-violent. Recognizing antonyms and synonyms can enhance one's vocabulary, enable them to communicate more efficiently and express their thoughts and ideas more accurately.