- That cannot be investigated or searched into; unknowable, inscrutable.
1621, Democritus Junior [pseudonym; Robert Burton], The Anatomy of Melancholy, Oxford: Printed by Iohn Lichfield and Iames Short, for Henry Cripps, OCLC 216894069; The Anatomy of Melancholy, 2nd corrected and augmented edition, Oxford: Printed by John Lichfield and James Short, for Henry Cripps, 1624, OCLC 54573970, (please specify |partition=1, 2, or 3):, II.3.3:
- He chastiseth and corrects, as to Him seems best, in His deep, unsearchable, and secret judgment, and all for our good.
- 1971, Keith Thomas, Religion and the Decline of Magic, Folio Society 2012, p. 103:
- Preachers warned […] that although God might sometimes make the meaning of his judgements clear they were normally unsearchable.
- That cannot be sought out or looked for.
- (computing) Not capable of being searched; on which one cannot perform a search.