Definition of unsearchable in English:
 unsearchable
adjectiveʌnˈsəːtʃəb(ə)lˌənˈsərCHəbəl
literary Unable to be clearly understood; inscrutable.
 their motives in coming were complex and unsearchable
 Example sentencesExamples
-  Last month we explored what it means to ‘preach the unsearchable riches of Christ’.
 -  The judgment of fallen men is not unsearchable. It is predictable.
 -  Call to me and I will answer you and tell you great and unsearchable things you do not know.
 -  How unsearchable are his judgments and how inscrutable his ways!
 -  How unsearchable are his judgments, and his ways past finding out.
 
Derivatives
  
noun
literary  Ah, now Simon Peter has also received a glimpse of the unsearchableness of the Lord's ways.
 Example sentencesExamples
-  The extremes of heaven's height and earth's depth are used to illustrate the unsearchableness of a king's heart.
 -  Where else can the unsearchableness of God be seen than in the great expanse of outer and inner space?
 -  A peculiarly characteristic artifice and pretext of Christian sophistry is the doctrine of the unsearchableness, the incomprehensibility of the divine nature.
 -  The unsearchableness of God is not cause of grief, but is matter of joy to all right-minded beings.
 
adverb
literary  What I ultimately received were life-filled messages that unveiled a vast, unlimited, extensive and unsearchably rich Christ, as typified by the land of Canaan in the Old Testament.
 Example sentencesExamples
-  I have seen that my Christian life is a quest to know this unsearchably rich Christ.
 -  Therefore, whatever aspect of Christ we enjoy, that aspect is unsearchably rich, isn't it?
 -  However, course grids suffer from loss of information, particularly in the circular units and the diagonal obstacles, and fine grids result in an unsearchably large space.
 -  It was as if we slept from Friday to Monday and dreamed an oppressive, unsearchably significant dream.