The term “irritant” refers to something that causes irritation or annoyance. The antonym of “irritant” could be “soothing” or “calming”.
For example, a harsh chemical might be an irritant to the skin, while a gentle lotion could be soothing. Or a loud noise could be an irritant to the ears, whereas soft music could be calming.
Another possible antonym could be “pleasing” or “agreeable”. An irritant is something that is not pleasant or welcome, whereas something pleasing is the opposite. For instance, a rude comment is an irritant, while a compliment is pleasing.
In summary, the antonyms of “irritant” are words that convey a sense of comfort, relaxation, or enjoyment rather than irritation or annoyance.