unseeably

adv

Etymology: From unseeable + -ly.

1. In an unseeable way; invisibly.

   “The Abbot knew that man was poised between two infinities, the unseeably tiny and the immensities of space […]”

   “Van Leeuwenhoek expanded his search for these unseeably small creatures and found them everywhere: on human eyelashes, on fleas, in dust, and on skin.”