Collocations for conceal - verb

completely
partially, partly
barely, scarcely
He waited with barely concealed impatience.

easily
The camera is small and easily concealed.

carefully, cleverly, cunningly (esp. BrE)
dishonestly (BrE,law)
effectively, successfully

be able to, be unable to
She was unable to conceal her surprise.

try to
manage to

from
He concealed the truth from her.

Conceal is used with these nouns as the subject:
exterior, mask

Conceal is used with these nouns as the object:
agitation, amusement, character, contempt, disappointment, emotion, enthusiasm, excitement, extent, fact, identity, impatience, irritation, nature, pain, shyness, smirk, truth, yawn