Obsessive Definition

əb-sĕsĭv, ŏb-
obsessives
adjective
Of, having the nature of, or causing an obsession or obsessions.
Webster's New World
Excessive in degree or nature.
An obsessive need to win.
American Heritage

Prone to cause obsession.

The idea is too tempting, it's obsessive.
Wiktionary
Having one thought or pursuing one activity to the absolute or nearly absolute exclusion of all others.
Hardcore fans' obsessive behavior may take over their lives.
Wiktionary
Synonyms:
noun
A person who has obsessive thoughts.
Webster's New World

Other Word Forms of Obsessive

Noun

Singular:
obsessive
Plural:
obsessives

Origin of Obsessive

  • obsess +"Ž -ive

    From Wiktionary

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