The term 'be forthright' refers to the act of being honest, direct, and straightforward with others. Antonyms of this phrase include words like deceitful, dishonest, evasive, disingenuous, vague, and insincere. When we describe someone as being deceitful, we mean that they are intentionally dishonest and misleading. Dishonest individuals lack integrity and cannot be trusted to tell the truth. Evasive individuals are known for avoiding direct answers or being cagey when it comes to sharing information. People who are disingenuous are insincere and sometimes fake, while those who are vague lack clarity in their communication. On the other hand, individuals who are forthright go beyond being honest and communicate in a direct and respectful manner.