invisible

Adjective
  1. Impossible or nearly impossible to see;
    Imperceptible by the eye (synset 302527322)
    "the invisible man"; "invisible rays"; "an invisible hinge"; "invisible mending"
    also:
    • covert - secret or hidden; not openly practiced or engaged in or shown or avowed
    • imperceptible, unperceivable - impossible or difficult to perceive by the mind or senses
    similar to:
    • camouflaged - made invisible by means of protective coloring
    • concealed, hidden, out of sight - not accessible to view
    • infrared - having or employing wavelengths longer than light but shorter than radio waves; lying outside the visible spectrum at its red end
    • lightless - giving no light
    • nonvisual - not resulting in vision
    • occult - hidden and difficult to see
    • ultraviolet - having or employing wavelengths shorter than light but longer than X-rays; lying outside the visible spectrum at its violet end
    • undetectable - not easily seen
    • unseen - not seen or perceived
    same as: unseeable
  2. Not prominent or readily noticeable (synset 300583752)
    "he pushed the string through an inconspicuous hole"; "the invisible man"
    tells us about: conspicuousness - high visibility
    similar to: obscure, unnoticeable - not drawing attention
    same as: inconspicuous

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