Definition

In a way that is impossible to understand or measure; extremely deep or complex.

Example

The ocean is unfathomably deep, making it difficult to explore its depths.

Conversation

Did you hear about that new documentary on space?

Yeah, I watched it last night, and it was unfathomably interesting!

I can't believe how vast the universe is.

Right? Some of the facts were just beyond my understanding!

Synonyms & Antonyms

Root Explanation

Unfathomably → It is formed from "un-" (meaning not), "fathom" (from Old English *fæðmian*, meaning to embrace or to measure), and "-ably" (meaning in a manner that can be). The word "unfathomably" means in a manner that cannot be measured or understood.

Memory Tip

Think of 'not' ('un-') being able to 'measure' ('fathom') something, which helps you remember that 'unfathomably' means something that cannot be understood or measured.

Visually Confused Words