When it comes to being truthful, there are several synonyms for the phrase "be honest." Some common alternatives include "tell the truth," "be sincere," "be frank," and "be candid." Other options include "speak openly," "be forthright," "be transparent," and "be plain-spoken." Each of these phrases implies a level of authenticity and integrity in communication, with the goal of being straightforward and honest with others. Whether in personal relationships, business interactions, or any other context, using synonyms for "be honest" can help convey a message of trust and respect.