Antonyms of adj cheeky

1 sense of cheeky

Sense 1
brash, cheeky, nervy -- (offensively bold; "a brash newcomer disputed the age-old rules for admission to the club"; "a nervy thing to say")

INDIRECT (VIA forward) -> backward -- ((used of temperament or behavior) marked by a retiring nature; "a backward lover")

Similarity of adj cheeky

1 sense of cheeky

Sense 1
brash, cheeky, nervy -- (offensively bold; "a brash newcomer disputed the age-old rules for admission to the club"; "a nervy thing to say")
       => forward (vs. backward) -- (used of temperament or behavior; lacking restraint or modesty; "a forward child badly in need of discipline")