lengthy

adjective

ˈleŋ(k)-thē 

ˈlen(t)-

lengthier; lengthiest

1

: protracted excessively : overlong

2

: extended, long

lengthily

ˈleŋ(k)-thə-lē 

ˈlen(t)-

adverb

lengthiness

ˈleŋ(k)-thē-nəs 

ˈlen(t)-

noun

Synonyms of lengthy

• long
• elongate

Examples of lengthy in a Sentence

The process is both lengthy and costly.

a series of lengthy delays

Lengthier trips require more planning.

Recent Examples on the Web

Lee spoke to The Observer about a number of topics in a lengthy conversation following his five-plus days in Las Vegas with the team. — Roderick Boone, Charlotte Observer, 23 July 2026

The lack of transparency results in many patients receiving unexpected bills, delays in getting care, and lengthy appeal processes. — Mary Ella Hastings july 23, Fort Worth Star-Telegram, 23 July 2026

And there are no signs of a lengthy dry spell to come, either. — Andrew Freedman, CNN Money, 23 July 2026

While Stern was preparing to interview others, AI can also be helpful for job seekers preparing to be interviewed, or for employees trying to summarize lengthy papers or draft presentations, for example. — Sarah Jackson, CNBC, 23 July 2026

Word History

First Known Use

1689, in the meaning defined at sense 1

Kids Definition

lengthy

adjective

ˈleŋ(k)-thē 

ˈlen(t)-

lengthier; lengthiest

: very long

lengthily

-thə-lē 

adverb

lengthiness

-thē-nəs 

noun