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

It’s packed with thickening, lengthening, and strengthening ingredients—rosemary, caffeine, and peptides. — Tamim Alnuweiri, InStyle, 10 July 2026

The secret is to choose a top with vertical details—think visible buttons, linear embroidery, or a high neck that visually lengthens the torso. — René Chávez Esparza, Glamour, 9 July 2026

These genes influence how quickly bones lengthen, how long each finger becomes, and how the joints and tendons are shaped. — Steven Lautzenheiser, The Conversation, 6 July 2026

For greater tensile strength, the Bluesign partner is using looms from Muller and Kyang Yhe to create webbing with an even density that lessens the amount the material lengthens when under tension. — Sarah Jones, Footwear News, 6 July 2026