unfastened Get Printable Handwriting Hear It! Say It! Write It! Learn It! Spelling Test Definition adjective. not tied or secured. Example Sentence Your shoelaces are unfastened. More Example Sentences He left the unfastened door open all night. Synonyms loose; open; free Antonyms fastened; secured; tied Hear It! Say It! Write It! unfastened Switch to cursive Start Share with your friends: