The term "laying thick" refers to excessive flattery or exaggerated praise that may be insincere or manipulative. Antonyms for this phrase would include being honest, straightforward, and genuine in communication. Instead of laying thick, one could opt to provide constructive criticism, unbiased feedback, or simply refrain from empty compliments. Other antonyms for the phrase may also be words like "modest", "humble", "realistic", "reserved", or "understated". Using these antonyms would help establish trust between individuals, foster sincere relationships, and promote a healthy exchange of thoughts and ideas.