[*] 121. In adjectives of Consonant stems— [*] a. The Ablative Singular commonly ends in -ī, but sometimes -e.
- Adjectives used as nouns (as superstes, survivor) have -e.
- Participles in -ns used as such (especially in the ablative absolute, § 419), or as nouns, regularly have -e; but participles used as adjectives have regularly -ī:—
- The following have regularly -ī:—āmēns, anceps , concors (and other compounds of cor ), cōnsors (but as a substantive, -e),dēgener, hebes , ingēns , inops , memor (and compounds), pār (in prose), perpes , praeceps , praepes , teres .
- The following have regularly -e: caeles , compos, [†dēses],dīves, hospes , particeps, pauper, prīnceps , sōspes , superstes . So also patrials (see § 71. 5) and stems in āt-, īt-, nt-, rt-, when used as nouns, and sometimes when used as adjectives.
- Always in compos, dīves, inops , particeps, praepes , prīnceps , supplex , and compounds of nouns which have -um: as, quadru-pēs, bi-color.
- Sometimes, in poetry, in participles in -ns: as, silentum concilium, a council of the silent shades (Aen. 6.432).