Antonyms for cheek

audacity, boldness:

fear, politeness, humility, respect, caution, modesty, shyness, manners.

side of human face:

timidity, humbleness, meekness.

noun:

civility, consideration, suavity, diffidence, diplomacy, gentility, graciousness, manners, politeness, suaveness, respect, deference, gallantry, cordiality, tactfulness, shyness, hesitancy, affability, smoothness, bashfulness, courtesy.