A house is hidden by foliage; the bird's nest is artfully concealed. Anything which is effectually covered and hidden under any mass or accumulation is buried.

J. C. Fernald, English Synonyms and Antonyms (1914)

Example sentences

private He covered the whole continent in his private jet.
invisible What would you do if you were invisible for a day?
concealed Tom concealed the fact that he had been in prison.
latent There are many latent gays among rampant homophobes.
secret Tom happened to let out the secret to his friends.

Popularity over time

Word	1850 → 2019	Trend
hidden		rising
private		steady
invisible		rising
concealed		steady
latent		steady
secret		rising

Use in printed books, per decade from 1850 to 2019.

By length

4 letters: dark¹
6 letters: secret², latent², veiled¹, occult²
7 letters: private², covered², unknown², obscure², cryptic²
8 letters: mystical³, secluded³, obscured², esoteric⁴
9 letters: invisible⁴, concealed², enigmatic⁴
10 letters: mysterious⁴, obfuscated, unrevealed, undivulged
11 letters: undisclosed³, clandestine³, sequestered³

The small number after each word is its number of syllables (secret² = 2 syllables).

In other languages

Français: caché
Español: escondido