Third-person singular simple present indicative form of unturn

Not turnable.

To turn in a reverse way, especially so as to open something.

present participle of unturn

Not turned.

(idiomatic) To search or investigate thoroughly. / (figuratively) To perform a task carefully and thoroughly, not missing any step.

Third-person singular simple present indicative form of leave no stone unturned

present participle of leave no stone unturned

simple past tense and past participle of leave no stone unturned