An implicit message is something that is suggested or hinted at, but not directly stated. It's the underlying message conveyed without using explicit words or actions. Full definition
The pervasive and multifaceted mass media, with its explicit and implicit messages about what is good and important. (betterevidence.org)
The hidden or implicit messages which destroy rather than cultivate relationship are usually critical, attacking, or condescending. (religion-online.org)
But since implicit messages are usually more important than manifest ones (they communicate «deep structures» rather than transient content), and since they are the part of the message that is least often subjected to critical examination, it seems doubly important to examine them in the case of this series. (religion-online.org)