The phrase "lays it on thick" refers to someone who exaggerates or flatters excessively. Antonyms for this phrase include words and phrases like low-key, understated, subtle, straightforward, and sincere. When someone is low-key, they are modest and don't draw too much attention to themselves. When someone is understated, they communicate with a subtle touch and don't make a big deal out of things. A straightforward person is honest and says what they mean without any embellishments. Finally, a sincere person is genuine and authentic, expressing their true feelings without any ulterior motives. All of these antonyms contrast with the over-the-top nature of "lays it on thick" and emphasize the importance of honest and straightforward communication.