1. superlative form of abstruse; most difficult to understand or comprehend; most obscure or complex
Usage: superlative degree of 'abstruse'; formal register

Examples

• The abstrusest passages in the philosophical text required multiple readings to grasp.
• Her abstrusest theories were debated among only the most specialized scholars.
• Of all the chapters, the final one presented the abstrusest concepts.
• The abstrusest mathematical proofs often take years for students to fully understand.
• Critics found his abstrusest work to be unnecessarily convoluted and inaccessible.