belie

Concise Oxford English Dictionary © 2008 Oxford University Press:
belie/bɪˈlʌɪ/

▶verb (belies, belying, belied)

• 1 fail to give a true notion of.

• 2 fail to justify (a claim or expectation).

– origin OE belēogan ‘deceive by lying’, from be- + lēogan ‘to lie’.