The word "gladder" is an adjective used to describe a feeling of happiness or joy. There are many synonyms for gladder that you can use to express a similar feeling, such as happier, delighted, elated, ecstatic, pleased, excited, thrilled, euphoric, and overjoyed. Each of these adjectives has a slightly different connotation, but they all convey a sense of happiness or pleasure. Whether you're describing your own emotions or someone else's, using synonyms for gladder can add nuance and depth to your writing or conversation. So the next time you want to express a feeling of happiness, consider using one of these synonyms for gladder.