Adjectives that have one syllable usually take -er and -est. Adjectives that have two syllables and end in y (early), ow (narrow), and le (gentle), can also take -er and -est. Almost all other adjectives with two or more syllables require the use of more and most.
Refer to #10 for anal retentive (and Southern) usage of the English language.
Thought you, being a writer, might appreciate the finer points of anal retentiveness.
No, not me, I'm a very regular writer.