continual occurring without interruption; chiefly restricted to what recurs regularly or frequently in a prolonged and closely spaced series; "the continual banging of the shutters"
insistent -
demanding attention; "clamant needs"; "a crying need"; "regarded literary questions as exigent and momentous"- H.L.Mencken; "insistent hunger"; "an instant need"
imperative requiring attention or action; "as nuclear weapons proliferate, preventing war becomes imperative"; "requests that grew more and more imperative"
insistent -
Standing on end: specifically said of the hindtoe of a bird when its base is inserted so high on the shank that only its tip touches the ground: correlated with incumbent.
