What is the comparative and superlative of thin?

What is the comparative and superlative of thin? 1. One syllable adjectives generally form the comparative by adding -er and the superlative by adding -est, e.g. Note that if a one-syllable adjective ends in a single vowel letter followed by a single consonant letter, the consonant letter is doubled, e.g. thin – thinner/thinnest, big – bigger/biggest.

1. One syllable adjectives generally form the comparative by adding -er and the superlative by adding -est, e.g. Note that if a one-syllable adjective ends in a single vowel letter followed by a single consonant letter, the consonant letter is doubled, e.g. thin – thinner/thinnest, big – bigger/biggest.