Synonyms of lengthen

lengthen

verb

ˈleŋ(k)-thən 

as in to extend

to make longer

I had to lengthen the handle of the paint roller in order to reach the top of the wall

Synonyms & Similar Words

• extend
• prolong
• increase
• stretch
• elongate
• protract
• expand
• drag (out)
• draw out
• enlarge
• outstretch
• amplify
• attenuate
• thin

Antonyms & Near Antonyms

• shorten
• cut
• reduce
• curtail
• decrease
• cut back
• diminish
• lessen
• abridge
• abbreviate
• thicken

Synonym Chooser

How does the verb lengthen contrast with its synonyms?

Some common synonyms of lengthen are extend, prolong, and protract. While all these words mean "to draw out or add to so as to increase in length," extend and lengthen imply a drawing out in space or time but extend may also imply increase in width, scope, area, or range.

extend a vacation

extend welfare services

lengthen a skirt

lengthen the workweek

When might prolong be a better fit than lengthen?

While the synonyms prolong and lengthen are close in meaning, prolong suggests chiefly increase in duration especially beyond usual limits.

prolonged illness

How are the words protract and prolong related as synonyms of lengthen?

Protract adds to prolong implications of needlessness, vexation, or indefiniteness.

protracted litigation

Example Sentences

Recent Examples of lengthen

Over the past several decades, as global temperatures have risen, the growing season has lengthened in many parts of North America. —Levi Keller, The Conversation, 5 May 2026

Deadheading spent flowers will lengthen the bloom period. —Mary Marlowe Leverette, Southern Living, 2 May 2026

If the company ticks a few remaining boxes, the drug could soon be on sale, kick-starting a new era of longevity medicine that could eventually also lengthen humans’ lives. —Ross Andersen, The Atlantic, 2 May 2026

Osceola County, currently contained entirely within District 9, will be chopped into two districts despite 9 being lengthened and extended well to the south. —Ryan Gillespie, The Orlando Sentinel, 2 May 2026