Showing disapproval is a common way to express dissatisfaction or disagreement with something. The crossword solutions for this term are HISS (4 letters), BOO (3 letters), JEER (4 letters), FROWN (5 letters), HOOT (4 letters), and RAISEONESEYEBROWS (17 letters). Hissing is a sound made by forcing air through the teeth, usually to show displeasure. Booing is a loud noise made to express disapproval. Jeering is a loud, mocking laugh used to express contempt. Frowning is a facial expression of displeasure or disapproval. Hooting is a loud, prolonged sound made to express disapproval. Raising one's eyebrows is a facial expression used to indicate surprise, disbelief, or disapproval.