1) The meaning of the ancient symbol was underivable from any known language.

2) The algorithm produced results that were underivable from the initial inputs.

3) The artist's inspiration seemed underivable, as if it came from a mysterious source.

4) The secret code appeared underivable without the key.

5) The mathematical proof was underivable using traditional methods.

6) Her decision-making process was underivable by her colleagues.

7) The complex chemical reaction was underivable without specialized equipment.

8) The unexpected outcome was underivable from the data collected.

9) The source of the rumors was underivable, leaving everyone confused.

10) The origins of the ancient ritual were underivable due to lost historical records.