Mealy-mouthed is an adjective used to describe someone who is insincere, deceitful or evasive with their words. Antonyms for this word include straightforward, honest, frank and outspoken. These words are used to describe someone who speaks their mind and does not beat around the bush. People who are straightforward are direct and to the point, while those who are honest are truthful and trustworthy. Someone who is frank is open and candid, while those who are outspoken speak their mind without fear of consequence. These antonyms serve to convey the opposite of mealy-mouthed, which is genuine and direct speech.