happening very often or with only short breaks

constant, incessant

hard-working; showing care and effort

persevering, hard-working

determined and stubborn when trying to solve or complete something

determined, persistent

full of, done with, energy

full of life; forceful

having hope; giving hope

optimistic, expectant

of, relating to, produced by, motion

energetic

very determined

determined, strong-willed

(of a storm etc) (continuing) without a decrease in strength

continuous, never-ending

never coming to an end

certain, unchanging

not hesitating

steadfast

not stopping

continual

never wanting to stop

determined, persevering