subtext

As a noun subtext

is the implicit meaning of a text, often a literary one, or a speech or dialogue.

As an adjective subtextless is

devoid of a subtext.

As nouns the difference between subtext and surtext

is that subtext is the implicit meaning of a text, often a literary one, or a speech or dialogue while surtext is the explicit or surface meaning of a literary text, as opposed to the subtext.