What's "said" on the page includes dialogue, gestures, and observable behaviors.
What's "unsaid" includes what's beneath the spoken and observable--the thoughts and expressions that the character is holding back, or choosing not to say and do.
In a well-developed character, what's said will contradict or conflict with what he's holding back (for whatever reason), and if a scene isn't working, it may be because what's going on beneath the "said" isn't compelling enough.
Be Brilliant!
~Katie~