Antonyms are words that have opposite meanings. When it comes to the word "apple-polish," which means to flatter someone insincerely, its antonyms would be words that convey the opposite meaning - criticism, disapproval, or straightforwardness. Criticism is the act of pointing out flaws or errors, while disapproval is the expression of disapproval or negative judgment. Straightforwardness could mean being honest, blunt, or frank with someone, rather than insincerely flattering them. Therefore, some antonyms for the word "apple-polish" might include censure, rebuke, condemnation, disfavor, candidness, or sincerity. It is important to remember that the use of antonyms can add value to writing and help express thought accurately.