Unfathomable

ahd-5
  • adjective. Difficult or impossible to understand; incomprehensible.
  • adjective. Difficult or impossible to measure.
  • The Century Dictionary and Cyclopedia
  • Incapable of being fathomed or sounded; too deep to be measured; hence, not capable of being sounded by thought or comprehended.
  • Wiktionary, Creative Commons Attribution/Share-Alike License
  • adjective. impossible to fathom or understand; incomprehensible
  • adjective. difficult to penetrate.
  • WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
  • adjective. of depth; not capable of being sounded or measured
  • adjective. resembling an abyss in depth; so deep as to be unmeasurable
  • adjective. impossible to come to understand
  • Word Usage
    "When he looked up, his wife was staring down at him, her expression unfathomable in the darkness."
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