You look disapprovingly, speak disapprovingly, or click your tongue disapprovingly: the word tells you how the showing happens. The meaning is the same as disapproving — you think someone or something is bad or wrong — but this form hangs on the action, not on the face or the person. Teachers, parents, and strangers on buses all do it. It can be a small, tight gesture or a full, cold sentence. Though actually, people sometimes say “she looked at me disapprovingly” when the look was only tired or surprised; the word is a little stronger than a mere raised eyebrow, even if speakers stretch it.