grownups Get Printable Handwriting Hear It! Say It! Write It! Learn It! Spelling Test Definition noun. people who are fully developed adults. Example Sentence Using a sharp knife is something better left to grownups. More Example Sentences Grownups often have more responsibilities than children. Synonyms adults; parents; guardians Antonyms children; kids; minors Hear It! Say It! Write It! grownups Switch to cursive Start Share with your friends: