Synonyms of the word

unseeable

• adj. invisible.
• adj. unimaginable.

camouflaged

• adj. wearing, in, or treated with, camouflage; disguised.
• v. simple past tense and past participle of camouflage.

concealed

• v. simple past tense and past participle of conceal.

covert

• adj. (now rare) Hidden, covered over; overgrown, sheltered.
• adj. (figuratively) Secret, surreptitious, concealed.
• n. A covering.
• n. A disguise.
• n. A hiding place.
• n. Area of thick undergrowth where animals hide.
• n. (ornithology) A feather that covers the bases of flight feathers.

hidden

• v. past participle of hide.
• adj. That has been moved out of sight. Invisible or unapparent.
• adj. Obscure.
• adj. That has been hidden.

imperceptible

• adj. Not perceptible, not detectable, too small in magnitude to be observed.

infrared

• n. electromagnetic radiation of a wavelength longer than visible light, but shorter than microwave radiation,…
• adj. Having the wavelength in the infrared.
• adj. In the infrared spectrum.

invisible

• adj. Unable to be seen; out of sight; not visible.
• adj. Not appearing on the surface.
• adj. (Internet) Apparently, but not actually, offline.
• adj. (psychology) That is ignored by a person.
• v. To invisiblize.
• n. (obsolete) An invisible person or thing; specifically, God, the Supreme Being.
• n. (obsolete) A Rosicrucian; so called because avoiding declaration of his craft.
• n. (obsolete) One of those (as in the 16th century) who denied the visibility of the church.

lightless

• adj. Lacking light; unilluminated.

nonvisual

• adj. Not visual.

occult

• v. (transitive, astronomy) To cover or hide from view.
• v. (transitive, rare) To dissimulate, conceal, or obfuscate.
• adj. (medicine) Secret; hidden from general knowledge; undetected.
• adj. Related to the occult; pertaining to mysticism, magic, or astrology.
• adj. Esoteric.
• n. (usually with "the") Supernatural affairs.

ultraviolet

• adj. of electromagnetic radiation beyond (higher in frequency than) light visible to the human eye; radiation…
• n. Ultraviolet colour.

undetectable

• adj. Unable to be detected; not detectable.

unperceivable

• adj. Not perceivable; imperceptible.

unseen

• adj. Not seen or discovered.
• adj. Unskilled; inexperienced.
• v. past participle of unsee.
• n. An examination involving material not previously seen or studied.