Synonyms of unpremeditated

unpremeditated

adjective

ˌən-(ˌ)prē-ˈme-də-ˌtā-təd 

1

as in accidental

happening by chance

an unpremeditated encounter with an old boyfriend

Synonyms & Similar Words

• accidental
• unexpected
• inadvertent
• chance
• unplanned
• unintentional
• incidental
• fortuitous
• casual
• unintended
• unwitting
• odd
• random
• arbitrary
• haphazard
• coincidental
• fluky
• unforeseen
• aimless
• unforeseeable
• desultory
• uncertain
• involuntary
• unconscious
• freak
• unprompted
• forced
• coerced

Antonyms & Near Antonyms

• deliberate
• premeditated
• intentional
• intended
• planned
• calculated
• inevitable
• certain
• predictable
• fixed
• sure
• foreseeable
• foreseen
• set
• destined
• expected
• prescribed
• premeditative
• predetermined
• conscious
• voluntary
• prepense
• unforced
• willful
• preordained
• predestined
• foreordained
• knowing
• volunteer
• freewill

2

as in impromptu

made or done without previous thought or preparation

an unpremeditated verbal attack that was prompted by an unexpected question at the press conference

Synonyms & Similar Words

• impromptu
• improvisational
• improvised
• spur-of-the-moment
• extemporaneous
• unrehearsed
• extemporary
• unplanned
• extempore
• unprepared
• spontaneous
• unstudied
• unconsidered
• unauthorized
• offhand
• off-the-cuff
• informal
• offhanded
• ad hoc
• snap
• impulsive
• automatic
• ad-lib
• instinctive
• unscripted
• down and dirty
• involuntary
• casual
• cursive
• ill-advised
• half-baked
• half-cocked

Antonyms & Near Antonyms

• prepared
• premeditated
• planned
• rehearsed
• intentional
• deliberate
• considered
• intended
• premeditative

Example Sentences

Recent Examples of unpremeditated

Petty Officer Jermiah Copeland received the sentence at a general court-martial after pleading guilty to unpremeditated murder and related charges in the death of Culinary Specialist 3rd Class Angelina Resendiz, Naval Criminal Investigative Service (NCIS) said Tuesday in a news release. — Stephen Sorace, FOXNews.com, 10 June 2026

Although the murderers are often characters with redeeming qualities, Nolan Hurst (David Cross) is more sympathetic than most, and his killing of toy store manager/part-time extortionist Patrick Palmer (Drew Seltzer) is an unpremeditated act of desperation, not the settling of a score. — Sophie Brookover, Vulture, 17 Oct. 2025

Those who forgave depicted the moment in mystical terms—unpremeditated, unexpected, the words just flowed. — Kevin Sack, Time, 3 June 2025

Richmond initially was charged with unpremeditated murder, which carries a maximum sentence of life in prison. — CBS News, 31 Jan. 2024

His determination to capture the naturalistic, unpremeditated aspects of his subjects made his work pulse with a startling sense of life. — The New Yorker, 11 May 2022

Sanick Dela Cruz is charged with unpremeditated murder and making a false statement. — CNN, 9 Mar. 2022

Rooney also resembled Hemingway—and Raymond Carver, a renovator of Hemingway’s minimalism whom Rooney has cited as an influence—in her ability to write dialogue that sounds unpremeditated but has a neutron-star density of drama and emotion. — Caleb Crain, The Atlantic, 10 Aug. 2021

Although in cancel culture the moral panics are roving and unpremeditated, they can still be exploited for the benefit of the dominant class. — New York Times, 3 Dec. 2020