The word "in-discreet" means lacking caution in one's speech or behavior. Antonyms for "in-discreet" include words like prudent, cautious, wise, tactful, guarded, and discreet. Prudent is the opposite of in-discreet as it means acting with good sense and judgement. Likewise, cautious means being wary and not taking unnecessary risks. Wise is another antonym because it suggests smart and thoughtful behavior. Tactful is the antonym of in-discreet as it describes being careful in what you say or do. Guarded means being careful what to say to avoid offenses. And finally, discreet means being careful not to be noticed or draw attention to oneself.