Antonyms for the word "under-tones" can be interpreted in a few different ways depending on the context. One way to approach this would be to think of words that have a completely opposite meaning to underlying or hidden tones. These could include the antonyms of overt, obvious, or prominent. Another possibility is to consider the opposite emotions or attitudes that under-tones might suggest, such as uncertainty, ambiguity, or suspicion. Antonyms that could work in this context might include clarity, certainty, trust, or confidence. Understanding antonyms for under-tones can help to convey a more precise and nuanced meaning in written or spoken language.