Can you list 15 rarely used adjective?

Sure! Here are 15 rarely used adjectives:

1. Insouciant – carefree or indifferent.
2. Sycophantic – excessively flattering or obsequious.
3. Quixotic – exceedingly idealistic, unrealistic.
4. Uxorious – excessively devoted to one’s wife.
5. Ineffable – too great to be expressed in Words.
6. Recalcitrant – stubbornly resistant to authority or control.
7. Languid – slow and relaxed; lacking energy.
8. Pulchritudinous – physically beautiful.
9. Obfuscatory – causing confusion or bewilderment.
10. Perspicacious – having keen insight or understanding.
11. Mendacious – dishonest or misleading.
12. Nefarious – wicked or criminal.
13. Vicissitudinous – characterized by changes or variations.
14. Abstruse – difficult to understand; obscure.
15. Preternatural – beyond what is normal or natural.