continuing for a very long time

continuing or existing for an indefinite time

(of a disease or physical condition) continuing for a long time

incessant, never-ending

happening very often or with only short breaks

constant, incessant

the act of continuing

addition; maintenance

hard-working; showing care and effort

persevering, hard-working

continuing for a long time

enduring, unending

alive, especially now; a means of keeping alive, of earning what is needed for life

existing, active

very determined

determined, strong-willed

holding tightly; very determined to get or keep something, be successful in winning an argument etc

strong, unyielding

not stopping

continual