DRUMBLE

a sluggish, slow-witted, or unintelligent person; a dullard. formerly also: †a worn-out or slow-moving horse or draught animal (obsolete).

a (usually wooded) hollow, dell, or gully; a dingle.

to move sluggishly; to go about something in a slow or sluggish manner; to dawdle.

to make a noise like the beating of a drum; to rumble.