A word for something that is deeper, more compelling than what is obvious or visible

Is there a word to describe the quality of something that is deeper, more substantial, or more compelling than what is obvious or originally thought?

I am thinking of something abstract, like a thought or something philosophical like Ursula K. Le Guin's definition of communication.

(Deceptively) profound -- not obviously, but deceptively profound. It sounds simple but has layers of complex meaning.

Profound adjective (of a person or statement) having or showing great knowledge or insight.

Source: dictionary definition at google search

Also read: ['deceptively' usage -- an earlier question and answers here at English.StackExchange.com] How should "deceptively" actually be used?

Example (mine) Professor B's lecture on the 'interconnectedness of experience' was deceptively profound.

Other examples: google search results for the exact phrase "deceptively profound"

Option 2: understated wisdom.