Verbal Adjectives (Derivational)
Latin can spin a verb directly into an adjective by tacking on a suffix. Audēre ("to dare") yields audāx ("bold"); cupere ("to desire") yields cupidus ("eager"); morī ("to die") yields moribundus ("dying, at the point of death").
These aren't participles. Participles are inflectional — they carry tense and voice and decline alongside the verb's own forms.
Verbal adjectives are derivational: brand-new words, frozen at the moment of formation, that just happen to remember their verbal parent.
Amātus ("having been loved") is a participle of amāre; amābilis ("lovable, capable of being loved") is a verbal adjective from the same root — different machinery, different meaning.
The trap: spotting which suffix means active tendency (-āx, -idus, -bundus) versus passive capability (-bilis, -tilis) lets you read the meaning straight off the form.
Stick a derivational suffix onto a verb stem and you get a brand-new adjective whose meaning you can read off the suffix.
These are NEW words frozen at formation — not inflected forms. They carry no tense or voice the way participles do.
See It In Action
— Sall. Cat. 5.4
Sallust pulls audāx off audēre ("to dare") with the -āx suffix — the suffix itself flags an aggressive, faulty boldness, which is exactly the Catiline portrait.
— Sall. Cat. 1.4
Fragilis doesn't say the glory IS broken — it says it CAN be broken. -ilis and -bilis almost always carry that passive-capability sense: "X-able."
— Verg. Aen. x.341
Moribundus names the warrior IN THE ACT of dying — the -bundus suffix marks continuance. A participle (moriēns) would do similar work, but moribundus is a derived adjective, frozen as a quality of the man.
"prone to X-ing," "X-ful," "in the habit of X-ing"
pugnāx = "prone to fighting," timidus = "fearful, full of fear"
"engaged in X-ing," "X-ing through and through"
moribundus = "in the act of dying," fācundus = "having the gift of speech"
"capable of being X-ed," "able to be X-ed," sometimes "made by X-ing"
amābilis = "capable of being loved," fossilis = "dug up out of the ground"
"having the X-quality," often a fixed condition rather than an action
vacuus = "empty (of)," captīvus = "in a captive state"
Both come off a verb. The verbal adjective is a new word with no tense or voice; the participle is an inflected form of the verb itself.
fixed quality, no tense/voice
homō amābilis
a lovable man (capable of being loved, in general)
tense + voice from the verb
homō amātus
a man who has been loved (specific past event)
Tip: Ask: does the form sit in the verb's own paradigm (present/perfect/future, active/passive)? Then it's a participle. Does it just describe a quality "X-able / X-ish / X-ing as a habit"? Verbal adjective.
In Vergil's moribundus volvitur arvīs (Aen. x.341), what does the -bundus suffix on moribundus tell you about the warrior's state?
Study Tips
- •When you meet an unfamiliar adjective ending in -āx, -idus, -bundus, -bilis, or -uus, peel the suffix off and look for a familiar verb stem underneath — half the time you'll already know the meaning.
- •Train the active/passive split: -āx and -idus describe an active tendency (the doer); -bilis and -tilis describe what can be done TO something (the receiver).
- •Don't confuse -bundus with the gerundive -ndus. Moribundus is "dying" (active continuance), not "about to die" or "needing to die" — that's the gerundive's job.