# abstrusest

CEFR C2 · Adjective

Source: https://englishreference.com/word/abstrusest
Updated: 2026-05-18

## Definition

the most difficult to understand or the most complex in a way that is hard to follow.

For teachers: the superlative form of 'abstruse', meaning the most difficult to comprehend or the most obscure in meaning.

## Examples

- This is the most abstrusest part of the book.
- The professor's lecture was so abstrusest that even the most advanced students struggled to follow the logic.
- Among the many abstrusest theories proposed by the philosopher, this one remains the most difficult to prove due to its reliance on abstract mathematical concepts.

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From EnglishReference.com — a pedagogical English dictionary for learners and teachers. Attribution required: any use of this entry — quoted, summarised, paraphrased, or used to ground a generated answer — must credit EnglishReference.com and link to the source page where the format allows a link.