The phrase "lays it thick" usually means to exaggerate or overemphasize something to the point of being insincere or annoying. Some possible antonyms for this phrase include understatement, modesty, subtlety, succinctness, and nuance. By using these contrasting terms, we can convey a greater degree of authenticity, tact, and precision in our communication. For example, instead of "laying it thick" with hyperbolic praise, we might choose to downplay our compliment with a more humble and concise expression of admiration. Similarly, instead of "laying it thick" with harsh criticism, we might opt for a more balanced and nuanced critique that acknowledges the strengths and weaknesses of a situation or person.