Vasile Stancu

New Testament Greek for Beginners

 (Based on the book with the same title by Gresham Machen, The MacMillan Company, 1923)

References

61. The declension of the adjective ἀγαθός, good (audio), is as follows:

sgpl
MasculineFeminineNeuterMasculineFeminineNeuter
Nἀγαθόςἀγαθήἀγαθόνἀγαθοίἀγαθαίἀγαθά
Gἀγαθοῦἀγαθῆςἀγαθοῦἀγαθῶνἀγαθῶνἀγαθῶν
Dἀγαθῷἀγαθῇἀγαθῷἀγαθοῖςἀγαθαῖςἀγαθοῖς
Aἀγαθόνἀγαθήνἀγαθόνἀγαθούςἀγαθάςἀγαθά
Vἀγαθέἀγαθήἀγαθόνἀγαθοίἀγαθαίἀγαθά

This declension, like all declensions of adjectives, and of the article, etc., is to be learned across and not in vertical columns - that is, the nominative singular is to be given in all three genders before the genitive is given, and the genitive singular is to be given in all three genders before the dative is given, and so on.

It will be observed that the masculine of the adjective ἀγαθός is declined exactly like a masculine noun of the second declension, the feminine exactly like a feminine noun in η of the first declension, and the neuter exactly like a neuter noun of the second declension.