Antonyms, words with opposite meanings, are crucial in enriching language. “Opposite of welcome” is a moderately close antonym of “welcome,” meaning “unwelcoming” or “diswelcoming.” It conveys a stark contrast in sentiment from being received with warmth to being rejected or turned away. Understanding such antonyms enhances our ability to express nuances and create emphasis in writing and communication, preventing errors like double negatives and ensuring the right word choice for the context.