Incessant

Part of speech: adjective (a.)

Continuing or following without interruption; unceasing; unitermitted; uninterrupted; continual; as, incessant clamors; incessant pain, etc. Against the castle gate, . . . Which with incessant force and endless hate, They batter'd day and night and entrance did await. Spenser.

Synonyms: Unceasing; uninterrupted; unintermitted; unremitting; ceaseless; continual; constant; perpetual.