I-Stems with Ablative -i

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

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Single-Termination Third Declension Adjectives

Here’s a review of triple- and twin-termination adjectives, covered in earlier posts:

• Triple-termination: ācer, ācris, ācre (sharp)
• Twin-termination: levis (m/f), leve (light)

Formation of Single-Termination Third Declension Adjectives

These are complicated because they take several possible consonant stems. That said, their declension is more-or-less equivalent to third declension i-stem nouns (nūbes, nūbis or mare, maris)

atrōx, actrōcis, fierce

A few things to note:

• The ablative singular may be either atrōcī or (less often) atrōce
• The neuter plurals all feature the i–stem (-ia, -ium, -ibus, etc.)
• The masculine and feminine plural accusative may (rarely) be atrocīs

Here are a few more nouns to consider:

egēns, egentis: needy

praeceps, praecipitis: headlong

pār, paris: equal, alike

ūber, ūberis: fruitful, copious

The Essential AG: 118

Famous Phrase: cēterīs pāribus [all other things being equal]

(an ablative absolute, denoting non-variable components of scientific experiments or other forms of structural reasoning)