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

incessant, never-ending

happening very often or with only short breaks

constant, incessant

having no end; never sopping

not stopping, not finishing

without beginning or end; lasting for ever

without pause; endless

going on for ever

infinite, never-ending

living for ever; never forgotten

death-defying, imperishable

continual; often repeated

never-ending, persistent

boring because (too) long

infinite

without stopping

never-ending, persistent

continuing throughout the whole year; lasting for a very long time; living for more than two years

enduring, perpetual

going on for a long time or without stopping

continual, lasting

(e.g. of a horse) not tamed; not interrupted; (of a record etc) not beaten

continuous, whole

going on, happening, all the time

incessant

everlasting; continuous

continuing

never coming to an end

certain, unchanging

not becoming less in force, degree

merciless

not stopping

continual