unseeably

comparative more unseeably · superlative most unseeably

1. In an unseeable way; invisibly.

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

   1975, Philip Mason, Kipling: the glass, the shadow and the fire

   1 more example

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

   2007, Kendall Haven, 100 Greatest Science Discoveries of All Time