"She spoke with a calm voice that belied her inner panic." (Her voice sounded steady, hiding her actual fear).
"His youthful face belied his eighty years." (He looked young, which contradicted the fact that he was old). "She spoke with a calm voice that belied her inner panic
because they mean the opposite; "belie" suggests a contradiction, not agreement. "belie" suggests a contradiction
because "belie" usually creates a mask or confusion rather than making something clearer. "She spoke with a calm voice that belied her inner panic