The phrase "is glad" means to be happy or pleased about something. Synonyms for this phrase include "is delighted", "is thrilled", "is ecstatic", "is overjoyed", "is elated", "is cheerful", "is merry", and "is content". All of these words express a significant amount of happiness or satisfaction about a particular situation or circumstance. For example, someone could say "I am delighted to hear the news" or "I am overjoyed to finally be on vacation". These synonyms serve as excellent replacements for "is glad" in any situation where you want to convey extreme happiness or pleasure.