Antonyms of adj bumptious

1 sense of bumptious

Sense 1
bumptious, self-assertive -- (offensively self-assertive)

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

Similarity of adj bumptious

1 sense of bumptious

Sense 1
bumptious, self-assertive -- (offensively self-assertive)
       => forward (vs. backward) -- (used of temperament or behavior; lacking restraint or modesty; "a forward child badly in need of discipline")