Building Vocabulary through Word Formation: Prefix in- (adjective)

Prefix: in- (+ adjective stem)

I. Read through the following definitions of English derivatives of Latin words and fill in the blanks with the appropriate translations of the Latin. Practicing analyzing derivatives in this way will help you practice translating Latin compound verbs and will also help you use your English in anaylzing and translating unknown Latin compound verbs. Again, after you have come up with your answer, you may check by holding the cursor over the maroon words. Think about the order that you translate the parts in. (link?)

A being that is immortal is (im-) _____ (mortālis) ________ (i.e. subject to mors ______).

Something that is immobile is (im-) _____ (mobilis) ______ (-ibile to be moveri _________)

Someone or something that is inimical is (in-) ___________ (amicus, -a, -um) ___________.

Something that is illicit is (il-) ________ (licet) ________.

What is the original form of the prefix? Does it assimilate? How?
What is the basic meaning of it?
What English prefixes is it the equivalent of?
Compare also Greek "alpha privative" (< Latin privō, -āre to strip, deprive of), e.g. a-typical, a-moral.

What would be the meaning of the following Latin words?

incrēdibilis, -e
incrēdibilī celeritāte . . . fama perfertur (Caes BG V.53)
impius, -a, -um

infelix (-icis)
infelix Dido (Verg Aen. 1.749 et al.)

ignotus, -a, -um (What happens to the "g" when there is no prefix? cf. cognoscō and its simple verb)
inermis, -e (What noun is the stem with vowel weakening after the prefix?
[Turnus who had grabbed his charioteer’s sword by mistake] fugit ut capulum [hilt]ignotum dextramque aspexit inermem (Verg Aen. 12.734)

improbus, -a, -um (The compound is more common than the simple probus; cf. the verb probō, -āre)
mala et improba defensio (Cic.Verr.
incertus, -a, -um
[Trojanī departing from Asia Minor] incertī quō fata ferant (Verg. Aen. 3.7)
inutilis, -e
[Priam] . . . inutile ferrum cingitur [girds on, middle voice] (Verg. Aen. 2.510)
ludere par impar [the Roman game of "even/odd"] Hor. Ser. 2.3.248)
immensus, -a, -um (metior, metīrī, mensus sum to measure; English?)
innocēns (English?)
inlaetabilis (also: illaetabilis):
hinc Drapanī mē portus et inlaetabilis ora accipit [of Aeneas and Sicily, foreshadowing the death of his father, Anchises] (Verg. Aen. 3.707)

invius, -a, -um (noun base?)
perque invia saxa (Verg. Aen. 1.537)
intactus, -a, -um (from participle of what verb? English?)
infirmus, -a, -um
impūrus, -a, -um
incautus, -a, -um (caveō, -ēre, cāvī, cautus)
inīquus, a-, -um (vowel weakening from what adjective?)
infans (from participle of what verb? What does this say about the substantive from this compound?)
invalidus (cf. valeō; English?)
insānus, -a, -um
insomnis, -e

What would be the following then?