Weak noun
See also Weak inflection
In the Icelandic language, nouns are considered weak, if they fulfill the following conditions:
Masculines:
An example of the latter is nemandi (student), plural nemendur. The words bóndi (farmer) and fjandi (enemy or the devil or a demon) belong to this class with some irregularities. The plural of bóndi is bændur. Fjandi has two plurals, depending on the meaning. If it means an enemy, the plural is fjendur (note the retention of je). If it means a demon, the plural is fjandar.