
At heart
True Nature
Use 'at heart' to express someone's true nature regardless of outward behavior.

He argues a lot, but he's generous at heart.
Contrasting Appearance
'At heart' often contrasts with a person's behavior or role that might suggest otherwise.

The strict teacher is actually very funny at heart.
At Core Belief
It underlines the core belief or inclination inside a person, sometimes hidden.

She fights for justice because she's an activist at heart.
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