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Definition of unseen : 1. Not seen or discovered.
2. Unskilled; inexperienced.

Synonyms:

spiritual world, invisible, undetected, unobserved, unseeable, spiritual domain

sensed, viewless, unnoticed, sightless, unsuspected, imperceptible, curtained, undiscovered, inconspicuous, dark, unnoted, imaginary, obscure, hidden, unperceived, unviewed, veiled, impalpable, unobtrusive, shrouded, occult

Usage examples:

• And in verity, I did feel as that afar upward in the night the black mountains that did make the sides of the Gorge had come together, and did make a monstrous roof unseen in the utter height. - "The Night Land", William Hope Hodgson.
• Major C. T. Bingham thus writes of this bird:-" It is very difficult to either watch these birds, unseen yourself, at one of their dancing parties, or to catch one of them actually sitting on the nest. - "The Nests and Eggs of Indian Birds, Volume 1", Allan O. Hume.
• Ill habits gather by unseen degrees. - "Slips of Speech", John H. Bechtel.