"Mouthings" refer to speaking in a pompous, insincere or empty manner. Its antonyms include sincere, genuine, honest, heartfelt, and candid. A person who speaks candidly and truthfully speaks with honesty and sincerity, unlike a person who speaks with mouthings, which seems disingenuous and shallow. A genuine comment is heartfelt and truthful, unlike an insincere one which sounds flattery and untruthful. In short, antonyms for the word "mouthings" are words that go beyond empty words and convey genuine emotion and honesty. When communicating, it's important to use sincere language as it builds trust, credibility, and maintains relationships.