imperceptible (adj.)
- atomic
- camouflaged
- concealed
- corpuscular
- disguised
- embryonic
- ephemeral
- evanescent
- faint
- fugitive
- germinal
- granular
- hidden
- ill-defined
- impalpable
- imponderable
- inappreciable
- inaudible
- inconsiderable
- inconspicuous
- indiscernible
- indistinct
- indistinguishable
- infinitesimal
- insensible
- insignificant
- intangible
- invisible
- latent
- microcosmic
- microscopic
- minuscule
- minute
- molecular
- momentary
- obscure
- secret
- sightless
- slight
- subatomic
- submerged
- subtle
- tenuous
- thin
- tiny
- trivial
- ultramicroscopic
- unapparent
- unclear
- undistinguishable
- unnoticeable
- unnoticed
- unobservable
- unobserved
- unperceivable
- unperceived
- unrealized
- unseeable
- unseen
- vague
- viewless
Seem'd washing his hands with invisible soap
In imperceptible water.
