One who does something habitually, such as a serial criminal offender.
A construction representing something done habitually.
Pertaining to an action performed customarily, ordinarily, or usually.
Of a person or thing: engaging in some behaviour as a habit or regularly.
Of or relating to a habit; established as a habit; performed over and over again; recurrent, recurring.
Regular or usual.
Not known; unidentified; not well known.
A variable (usually x, y or z) whose value is to be found.
A person of no identity; a nonentity
Any thing, place, or situation about which nothing is known; an unknown fact or piece of information.