Contagious laugh is a phrase that refers to a person's ability to make others laugh as well. It's a term that carries a sense of positivity and lightness, and is often associated with people with a great sense of humor and a charming personality. There are several synonyms for contagious laugh, including infectious laughter, rollicking laughter, uproarious laughter, and uncontrollable laughter. These terms all refer to laughter that spreads easily and brings joy to everyone in the vicinity. A contagious laugh is a valuable quality in social situations - it can break the ice, ease tension, and make people feel more comfortable and connected to each other.