compulsive, compulsory Definition

compulsive
adj

1. Having the power to compel.
2. Said of an action: resulting from a compulsion.

Thesaurus: compelling, passionate, overwhelming, incorrigible, irresistible, overpowering; Antonym: controllable.
3. Said of a person: acting on a compulsion.
4. Said of a book, film, etc: holding the attention; fascinating.

Derivative: compulsively
adverb

Etymology: 17c: from Latin compulsivus.

Info:

These words are sometimes confused with each other.