gradual
/ˈɡrædʒuəl/Definitions
1. adjective
moving or proceeding slowly and smoothly; not sudden or rapid
“The gradual change in the weather surprised me.”
2. noun
a gradual or steady movement or process
“The gradual improvement in her health was a relief to her family.”
3. verb
to become or make something gradual or less sudden
“The new policy is intended to gradually phase out the old system.”