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Superlatives of adjectives ending in -lis are usually formed with the suffix -limus. For example, the superlative of facilis is facillimus. So, why is the superlative of fertilis fertilissimus, rather than fertillimus?

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The superlative ending -illimus is actually exceptional, although the exceptional adjectives are quite common. The adjectives with this superlative ending are facilis, difficilis, similis, dissimilis, gracilis, humilis. Other adjectives ending in -ilis, including fertilis, have the more regular superlative -ilissimus.

See §126 in A&G.

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