wearing a mask on all or part of the face

a raid by masked gunmen

masked dancers

(of one's true character or feelings) concealed

the barely masked anger in their tone

cover (the face) with a mask

he had been masked, bound, and abducted

conceal (something) from view

the poplars masked a factory

cover (an object or surface) so as to protect it during painting

mask off doors and cupboards with sheets of plastic