Unfathomable
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Abstract Concepts
Use 'unfathomable' to describe complex ideas or things not easily measured or understood. The concept of infinity is unfathomable to many.
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Emotional Impact
'Unfathomable' can express a strong emotional response to the vastness or complexity of something. Her kindness was truly unfathomable.
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Hyperbolic Usage
Sometimes used to exaggerate for dramatic effect, not to be taken literally. He had an unfathomable amount of homework.