- rapid, speedy - characterized by speed; moving with or capable of moving with high speed; "a rapid movment"; "a speedy car"; "a speedy errand boy"
Antonym: slow (indirect, via fast)
- quick, speedy - accomplished rapidly and without delay; "was quick to make friends"; "his quick reaction prevented an accident"; "hoped for a speedy resolution of the problem"; "a speedy recovery"; "he has a right to a speedy trial"
Antonym: slow (indirect, via fast)