When it comes to antonyms for "pretty speech," we can think of harsh, brusque, blunt, direct, rude, unpolished, and rough. These words all connote a lack of refinement and subtlety, which are the hallmarks of pretty speech. While pretty speech is admired for its charm, grace, and eloquence, these antonyms are seen as negative qualities that undermine a speaker's credibility and effectiveness. Harsh and rude speech can be alienating and offensive, while unpolished and rough speech may lack the finesse and tact needed to convey a message effectively. Ultimately, the choice of words and tone must match the occasion and audience, and not all situations call for pretty speech.