There is a certain kinship between Greek and Latin (a) comparative and (b) superlative forms, as well as between (c) a particular branch of Latin positive adjectives and Greek comparatives.
To recall your knowledge of positives, comparatives, and superlatives in each language, let’s view a few examples:
- Dark, darker, darkest
- niger, nigrior, nigerrimus
- μέλας, μελάντερος, μελάντατος
- Big, bigger, biggest
- magnus, maior, maximus
- μέγας, μείζων, μεγίστος
- Dear, dearer, dearest
- cārus, cārior, cārissimus
- φίλος, φιλότερος, φιλότατος
- Sweet, sweeter, sweetest
- suavis, suavior, suavissimus
- ἡδύς, ἥδιος, ἥδιστος
I struggle here to explain the precise interrelations between the various forms above, because A&G are quite tight-lipped about the matter (everything in this post is drawn from two far-disparate footnotes). However, we see a certain kinship between:
- the Latin comparative (n.) -ius [e.g. nigrior (m/f), nigrius (n)] and the Greek -ίων [e.g. μείων (smaller, less)]
- the Latin superlative –issimus [suavissimus] and the Greek -ιστος [ἥδιστος]
(these ^^ are also both relative to the English superlative [e.g. sweetest])
- the Latin positive –ter (ater, atra, atrum) and the Greek -τερος (φιλότερος)
I think that last one is a bit of a stretch, so don’t shoot the messenger (of AG 214bn), but shoot me a comment if you disagree either with their claim or with my reading of their claim, and explain why.
The Essential AG: 124n1, 214bn