Main entry: gradual
Definition: proceeding in small stages
Usage: a gradual increase in prices
Antonyms: sudden
Definition: happening without warning or in a short space of time
Main entry: gradual
Definition: (of a topographical gradient) not steep or abrupt
Usage: a gradual slope
Antonyms: steep
Definition: having a sharp inclination
Definition: not easy; requiring great physical or mental effort to accomplish or comprehend or endure
Antonyms: uneasy
Definition: lacking a sense of security or affording no ease or reassurance