Here’s the other half of that list that I started in (this post). These are the class of consonantal adjectives that tend not to operate as quasi-nouns, and therefore tend to take -i in the ablative, rather than -e.
- āmēns, āmentis, frantic, crazed
- anceps, ancipis, double, doubtful
- concors, concordis, agreed, joint
- dēgener, dēgeneris, low-born, weak
- hebes, hebetis, dull, blunt
- ingēns, ingentis, huge, vast
- inops, inopis, needy, helpless
- memor, memoris, mindful of
- pār, paris, alike, equal to
- perpes, perpetis, lasting
- praeceps, praecipitis, headlong
- praepes, praepitis, nimble, winged
- teres, teretis, smooth
Sorry for the relative obscurity of these last two posts. The thing is, they cover a few footnotes in Allen and Greenough that I feel should be out there on the Internet, preferably with a basic entry format and definition.
The Essential AG: 121a3