Grade 3 overcast Get Printable Handwriting (o-ver-cast) 3 syllables Rhymes Learn It! Spelling Test Definition noun. the state of the sky when it is covered by cloudsadjective. filled or abounding with clouds Example Sentence The sky outside was overcast. Synonyms cloudy; cloud cover; sunless Antonyms sunny Rhymes Three Syllable Rhymes (1) overcast Share with your friends: