in·​fi·​nite·​ly | \ˈin-fə-nət-lē \

Definition of infinitely 

: 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

First Known Use of infinitely

15th century, in the meaning defined above

History and Etymology for infinitely

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

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

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