(1):

(a.) Without profitable end; fruitless; unsatisfying.

(2):

(a.) Void of design; objectless; as, an endless pursuit.

(3):

(a.) Without end; having no end or conclusion; perpetual; interminable; - applied to length, and to duration; as, an endless line; endless time; endless bliss; endless praise; endless clamor.

(4):

(a.) Infinite; excessive; unlimited.