LOUSE UP Synonyms: 80 Similar and Opposite Words

louse up

verb

Definition of louse up

as in to stumble

to make a mistake everything is riding on this project, so we can't afford to louse up

Synonyms & Similar Words

Relevance

as in to fumble

to make or do (something) in a clumsy or unskillful way I loused up the wallpapering job in the bedroom—the seams show too much

Synonyms & Similar Words

Antonyms & Near Antonyms

Example Sentences

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.

Recent Examples of louse up Maybe one party simply wants out for no apparent reason Anything can louse up the deal. — Lew Sichelman, Miami Herald, 28 May 2026 Which is to say that America’s most prominent vaccine skeptic could have the power to upend, derail, or otherwise louse up a cornerstone of public health. — Daniel Engber, The Atlantic, 20 Nov. 2024 Conversely, one of the easiest ways to louse up a team on draft day is to load up a team with players who aren’t going to produce at a level commensurate with when they were drafted. — Gary Davenport, The Athletic, 5 Aug. 2024

Recent Examples of Synonyms for louse up

Verb

Vulcan has stumbled due to ongoing problems with the performance of its solid rocket boosters, which are provided by Northrop Grumman.

— Eric Berger, ArsTechnica, 17 Aug. 2026
Nothing that would actually stop a person, a child, a wheelchair or a stumbling drunk from going straight into the water.

— Joseph V. Sakran, Baltimore Sun, 15 Aug. 2026

Definition of stumble

Verb

Lake Brantley appeared to have picked up the first down on third down but the ball was fumbled backwards to put the Patriots in fourth and long.

— Buddy Collings, The Orlando Sentinel, 14 Aug. 2026
After Carter Jensen flew out to deep center field, Caglianone tagged from second base and kept running toward home as outfielder Andy Pages fumbled the baseball out of his glove.

— Kansas City Star, Kansas City Star, 12 Aug. 2026

Definition of fumble

Verb

California is attempting to build the nation's first bullet train, a project that's ballooned in cost and has blown through deadline after deadline for more than a decade.

— Julie Watts, CBS News, 18 Aug. 2026
The technology adapts the physics of Helmholtz resonance, which is the physical phenomenon behind the hum produced by blowing across a bottle neck.

— Mrigakshi Dixit, Interesting Engineering, 17 Aug. 2026

Definition of blow

Verb

The Iberians slipped up big time in their first match of the tournament, being shocked by Switzerland 1-0, bringing back ghosts of tournament failures past for Spanish fans.

— Patrick Sung Cuadrado, CNN Money, 14 July 2026
But for taxpayers with a solid compliance history who slip up once, automatically applying relief—instead of reserving it for those who know to ask—is a welcome change.

— Kelly Phillips Erb, Forbes.com, 11 July 2026

Definition of slip up

Verb

Every time a player screwed up, the coaching staff and his teammates received a text message, calling out both the infraction and the guilty party.

— Dana O’Neil, CNN Money, 14 Aug. 2026
That growth is mostly a testament to how screwed up our school bus system currently is.

— Maggie McGrath, Forbes.com, 12 Aug. 2026

Definition of screw up

Verb

In the end, though, neither an explosion nor a giant spill of fluid that could foul up waterways and the ocean occurred.

— Hannah Fry, Los Angeles Times, 27 May 2026
An incorrect connection or approach can foul up a line, damage a plane or cause an accident.

— Tara Copp The Washington Post, Arkansas Online, 25 May 2026

Definition of foul up

Verb

Campione said her campaign was focused on protecting rural lands from being annexed into cities for rural subdivisions and stopping activities that could ruin water quality or override property rights.

— James Wilkins, The Orlando Sentinel, 13 Aug. 2026
But the mellow vibes are ruined when a goofy case of mistaken identity results in Frankie coming home with a briefcase containing several vials of a glowing orange goo.

— Angie Han, HollywoodReporter, 12 Aug. 2026

Definition of ruin

Browse Nearby Words

louses up

louse up

lousily

See all Nearby Words

Cite this Entry

Style

“Louse up.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/louse%20up. Accessed 19 Aug. 2026.

Copy Citation

Synonyms of louse up

verb

Example Sentences

Browse Nearby Words

Cite this Entry

More from Merriam-Webster

Word of the Day

balmy

Popular in Grammar & Usage

A Who’s Who Regarding ‘Who’s’ and ‘Whose’

7 Pairs of Commonly Confused Words

'A' or 'an'? What about before 'h'? An Indefinite Article Guide

Do you 'say your piece' or 'say your peace'?

Why is '-ed' sometimes pronounced at the end of a word?

Popular in Wordplay

Words from the 'Odyssey'

The Longest Long Words List

It's a Scorcher! Words for the Summer Heat

Is “GIF” Pronounced “Jiff” or “Giff”?

12 Lovely and Unusual Words for the Natural World

Popular

A Who’s Who Regarding ‘Who’s’ and ‘Whose’

Words from the 'Odyssey'

The Longest Long Words List

Games & Quizzes