The definition of unprecedented is something that has not happened before.
Not known; unfamiliar:
Of something or one believed to be of cause or at fault.
Having received approval.
The definition of improbable is something unlikely to happen or unlikely to be true.
Generally regarded as true, valid, proper, etc.; conventional; approved
Find another word for unsuspected. In this page you can discover 12 synonyms, antonyms, idiomatic expressions, and related words for unsuspected, like: inconceived, unprecedented, unknown, suspected, unrevealed, unimagined, unexplored, trusted, uncontested, approved and improbable.