sleepyheaded Get Printable Handwriting Hear It! Say It! Write It! Learn It! Spelling Test Definition noun. informal a sleepy or lazy person Example Sentence The classroom was filled with sleepyheaded students. Synonyms sleepy; sleepy-eyed" class="word-page__definition-link">sleepy-eyed; asleep Antonyms awake Hear It! Say It! Write It! sleepyheaded Switch to cursive Start Share with your friends: