unfathomable
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un·fath·om·able

adjective \-ˈfa-thə-mə-bəl\

Definition of UNFATHOMABLE

: not capable of being fathomed:
a : immeasurable
b : impossible to comprehend

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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