revealed — to make known; disclose; divulge: to reveal a secret.
unfurnished — to supply (a house, room, etc.) with necessary furniture, carpets, appliances, etc.
unheeded — to give careful attention to: He did not heed the warning.
unnoticed — an announcement or intimation of something impending; warning: a day's notice.
unknown — not known; not within the range of one's knowledge, experience, or understanding; strange; unfamiliar.
noun covered
discovered — to see, get knowledge of, learn of, find, or find out; gain sight or knowledge of (something previously unseen or unknown): to discover America; to discover electricity. Synonyms: detect, espy, descry, discern, ascertain, unearth, ferret out, notice.