searchless

Impossible to be searched; inscrutable; impenetrable.

Th'inticing Smile; the modest-seeming eye, Beneath whose Beaueous Beams, belying Heaven, Lurk searchless Cunning, Cruelty, and Death: And still, false-warbling in his cheated Ear, Her syren Voice, enchanting, draws him on, To guileful Shores, and Meads of fatal Joy.

Famine, murder, hell and power Were glutted in that glorious hour Which searchless fate had stamped for me With the seal of her security

Vast; Too massive or great to be fully known.

O Goodness searchless! Thou who once didst walk With man on earth, with man familiar talk,!

I'll sing the searchless depths of the compassion divine, The depths unfathomed yet By reason's plummet and the line of wit, - Too light the plummet and too short the line;

That arrives at a solution by analytic means, rather than by trial and error or iterative searching.

Finding of the optimum regime, corresponding to the extremum of the quality index, may be carried out by an automatic search (search and extremal ACS) or by a searchless way ( searchless or analytical ACS).

As an alternative and an extension to the trial-and-error adaptation employed in systems with extremum-seeking regulatory mechanisms is the idea of direct, searchless optimization proposed in the 1960s.