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.