Most English adjectives take on the suffixes -er and est as they journey from their base forms to their comparative and superlative incarnations, as in smart smarter smartest and funny funnier funniest. Some intrepid logologists have created sequences of unrelated words that look like adjectival progressions but aren't.
Lederer, Richard and Mann, Kern
"Highly Irregular Verbs,"
Word Ways: Vol. 43
, Article 3.
Available at: http://digitalcommons.butler.edu/wordways/vol43/iss4/3