Definition of unfathomable:
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)
- "Cord and Creese", James de Mille.
- "Poor Relations", Compton Mackenzie.
The sense of drowning in this profound, unfathomable element, of shutting her eyes and opening her arms to it, was the highest she had ever touched; but all at once the memory of what she was leaving behind her, like a last glimpse of sky, swept her with fear.- "The Coast of Chance", Esther Chamberlain Lucia Chamberlain.