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Synonyms

lengthy

American  
[lengk-thee, leng-, len-] / ˈlɛŋk θi, ˈlɛŋ-, ˈlɛn- /

adjective

lengthier, lengthiest
  1. having or being of great length; very long.

    a lengthy journey.

  2. tediously verbose; very long; too long.

    a lengthy speech.


lengthy British  
/ ˈlɛŋθɪ, ˈlɛŋkθɪ /

adjective

  1. of relatively great or tiresome extent or duration

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Other Word Forms

  • lengthily adverb
  • lengthiness noun

Etymology

Origin of lengthy

An Americanism dating back to 1680–90; length + -y 1

Explanation

Lengthy things are long and drawn out. Your teacher's lengthy lecture might extend far beyond the end of class and leave many people dozing at their desks. The adjective lengthy is almost always used to describe a duration of time (or sometimes a long piece of writing), rather than the physical length of something. So long-lasting speeches and endless waits at the bus stop could both be called lengthy, but you wouldn't describe your friend's long hair that way. Lengthy is an 18th century American invention, also adopted by the British in the nineteenth century.

Keep Reading on Vocabulary.com

Vocabulary lists containing lengthy

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

“On the weaponization side, the damage appears to be like punching holes, creating bottlenecks in the multitiered, lengthy process of making the nuclear weapons itself,” Albright said.

From The Wall Street Journal • Apr. 12, 2026

The 58-year-old Canadian singer announced last month that she was returning to the stage for 16 concerts after a lengthy break prompted by a rare health condition.

From Barron's • Apr. 10, 2026

Job security is a key feature of the job hunt these days, and searches for people who are unemployed can be lengthy.

From MarketWatch • Apr. 10, 2026

Ahead of the reunion’s premiere, Colletti and Conrad, both 40, and Cavallari, 39, convened for a lengthy interview with The Times at a beachfront hotel restaurant in Santa Monica.

From Los Angeles Times • Apr. 9, 2026

They ran like wild colts as before, and went to see Robin when they had a mind to, and had innumerable adventures too lengthy to be recorded.

From "The Once and Future King" by T. H. White