Those ending in -nes or -ung are feminine (cf. Modern 12 English goodness, and gerundial forms in -ing: seeing is believing).
The infinitive, or its noun, is used for the gerund, or a gerundial phrase in English.
This use of the gerundial infinitive is frequent in AR, comp.
To seye is the gerundial or dative infinitive; see Morris, Hist.
The gerundial termination -enne, superseded by the infinitive termination -en; as to lufian for to lufienne, or lufigenne.
1510s, from Late Latin gerundium, from Old Latin gerundum "to be carried out," gerundive of gerere "to bear, carry" (see gest). In Latin, a verbal noun used for all cases of the infinitive but the nominative; applied in English to verbal nouns in -ing.