What is the superlative degree of happy?

What is the superlative degree of happy? The ending -est is used to create the superlative of adjectives and adverbs ending in -y, -le, or -er. Just as with the comparative, this applies only to one-syllable adjectives and those that end in -y, -le, or -er and have two syllables. For example, happy becomes happiest.

The ending -est is used to create the superlative of adjectives and adverbs ending in -y, -le, or -er. Just as with the comparative, this applies only to one-syllable adjectives and those that end in -y, -le, or -er and have two syllables. For example, happy becomes happiest.