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unfathomable

 - 2 dictionary results
un·fath·om·a·ble   (ŭn-fāth'ə-mə-bəl)   
adj.  
  1. Difficult or impossible to understand; incomprehensible: unfathomable theories.

  2. Difficult or impossible to measure: the unfathomable depths.

The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Word Origin & History

unfathomable 
1617, originally in the fig. sense, of feelings, conditions, etc., from un- (1) "not" + fathom (v.) + -able. Lit. sense attested from c.1676.
Online Etymology Dictionary, © 2001 Douglas Harper
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