: to an infinite or seemingly infinite extent or degree
an infinitely large number
It is clear that when an infinite number of positive quantities are added, the result will be infinitely large unless the quantities diminish in size to zero.Dan Kalman
… we know that the world is infinitely more complicated than the child thinks.Robert Penn Warren
… in learning about the amazing complexity of the computer, we come to appreciate the infinitely more amazing complexity of the human brain …Alex Raskin
He swivels his head almost 360 degrees, like a Japanese puppet-balloon held aloft on a stick. The face is infinitely old, infinitely wise, very catlike.Maxine Kumin

Examples of infinitely in a Sentence

Recent Examples on the Web
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.
Here, the landscape should be made up of possibly many seas, each infinitely large. Leila Sloman, Quanta Magazine, 31 Aug. 2026 The settlement The state attorneys general had accused Meta of intentionally designing features — such as an infinitely scrolling feed, algorithmic recommendations and frequent notifications — to hook kids and teens. Clare Duffy, CNN Money, 26 Aug. 2026 Mod Periscope The perfect tool to peek out of secret hideouts—and infinitely customizable! Jodi Levine, Parents, 21 Aug. 2026 Now my cleaning routine is infinitely easier and significantly more effective. Katherine McLaughlin, Architectural Digest, 20 Aug. 2026 See All Example Sentences for infinitely

Word History

Etymology

Middle English infynytly, from infynyt infinite entry 1 + -ly -ly entry 2

First Known Use

15th century, in the meaning defined above

Time Traveler
The first known use of infinitely was in the 15th century

Cite this Entry

“Infinitely.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/infinitely. Accessed 1 Sep. 2026.

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