Dictionary

unfathomable

adjective un·fath·om·able \-ˈfa-thə-mə-bəl\

: impossible to understand

Full Definition of UNFATHOMABLE

:  not capable of being fathomed:
a :  immeasurable
b :  impossible to comprehend
un·fath·om·ably\-blē\ adverb

Examples of UNFATHOMABLE

  1. His behavior is completely unfathomable.
  2. <the unfathomable reaches of space>

First Known Use of UNFATHOMABLE

1640

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