unthaw Get Printable Handwriting Hear It! Say It! Write It! Learn It! Spelling Test Definition verb. to melt or thaw something that is frozen. Example Sentence The sun will unthaw the ice. More Example Sentences The ice will unthaw in the sun. Synonyms thaw; melt; defrost Antonyms freeze; solidify Hear It! Say It! Write It! unthaw Switch to cursive Start Share with your friends: