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Definition of unfathomable:

  1. That cannot be sounded by a line; too deep for measuring.


inscrutable, limitless, countless, confusing, mysterious, complex, unlimited, endless, illimitable, uncomprehensible, abstruse, involved, measureless, eternal, impenetrable, fathomless, horizonless, unintelligible, unsoundable, difficult, numberless, contorted, boundless, knowledge, immensurable, immeasurable, innumerable, incomprehensible, unmeasured, abyssal, enigmatic, elaborate, intricate, confused, complicated, unbounded, ungraspable, unconditioned, absolute, interminable, abysmal, indefinite, incomprehensible, bottomless, abyssal, infinite.

  • infinite (part of speech: adjective)

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