(i) = asunder, apart.

discēdere = part asunder, depart.
discernere = separate, distinguish.
dīmittere = send in different directions.

(ii) = un- (negative).

displĭcēre = displease.
diffīdere = distrust.

(iii) = exceedingly.

differtus = crammed to bursting.

(iv) = individually, separately.

dīnŭmĕrare = count up (singly).

IN- (cf. ἀν-, ἀ-) = UN-, usually with adjectives.

ignoscere = not to know, forget, pardon.
innŏcens = not guilty, harmless.