obsess

verb

ob·​sess əb-ˈses How to pronounce obsess (audio)
äb-
obsessed; obsessing; obsesses

transitive verb

: to haunt or excessively preoccupy the mind of
was obsessed with the idea
She was obsessed with her car.

intransitive verb

: to engage in obsessive thinking : become obsessed with an idea
He's always obsessing over money.

Examples of obsess in a Sentence

The war obsesses him—he talks about nothing else. You need to stop obsessing and just deal with the problem.
Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Internet viewers were obsessed with the partner's act of kindness, but many mistakenly assumed the hairdresser was a woman. David Faris, Newsweek, 17 Mar. 2025 Nero Wolfe, who is loath to set foot outside his brownstone on West Thirty-fifth Street, is obsessed with orchids and dedicates four hours a day to tending to them in his plant rooms on the roof. Jill Lepore, The New Yorker, 17 Mar. 2025 Like Frank, Rick is obsessed with desire, but his ultimate goal is to commit bloody murder, rather than indulge in a series of increasingly elaborate hookups. Dani Di Placido, Forbes, 17 Mar. 2025 We've long been obsessed with the 27-year-old beauty queen, and are equally invested in her romance with Timothée Chalamet. Lena Raab, Glamour, 16 Mar. 2025 See All Example Sentences for obsess

Word History

Etymology

Middle English, in be obscessed "be tormented by (the Devil, an evil spirit)," borrowed from Latin obsessus, past participle of obsidēre "to sit so as to occupy a position, occupy, frequent, besiege, blockade, beset, assail" (Late Latin, "[of a demon] to possess"), from ob- "toward, facing, against" + sedēre "to sit, be seated" — more at ob-, sit entry 1

Note: This verb in its participle form obsessed is fairly common in early Modern English as a metaphorical extension of its Latin etymon in the sense "besiege, beset," the torment attributed to the Devil being compared to the besieging of a fortress. The same applies to the associated noun obsession. With these meanings the word is sometimes accompanied by its synonyms possessed and possession. From about 1660 to the early nineteenth century obsess and obsession are exceedingly rare in English text outside of dictionaries. They then begin to revive, but without any religious connotation, perhaps stimulated by parallel use in French of obséder and obsession.

First Known Use

1531, in the meaning defined at transitive sense

Time Traveler
The first known use of obsess was in 1531

Cite this Entry

“Obsess.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/obsess. Accessed 22 Mar. 2025.

Kids Definition

obsess

verb
ob·​sess əb-ˈses How to pronounce obsess (audio)
äb-
: to occupy the mind of completely or abnormally
obsessed with this new scheme

Medical Definition

obsess

transitive verb
ob·​sess əb-ˈses, äb- How to pronounce obsess (audio)
: to preoccupy intensely or abnormally
was obsessed with success

intransitive verb

: to engage in obsessive thinking
solve problems rather than obsess about themCarol Tavris

More from Merriam-Webster on obsess

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