incapable of being seen, whether by nature or because of concealment
An atheist is a man who has no invisible means of support — John Buchan
not appearing in published financial statements
invisible assets
not reflected in statistics
invisible earnings
of or being trade in services, e.g. insurance or tourism, rather than goods: compare visible
too small or unobtrusive to be seen or noticed; inconspicuous
invisibility /-zəʹbiliti/ noun
invisibleness noun
invisibly adv
[Middle English via French from Latin invisibilis, from in-1 + visibilis: see visible]