undetermine Get Printable Handwriting Hear It! Say It! Write It! Learn It! Spelling Test Definition verb. to make something less certain or unclear. Example Sentence The answer is undetermine. More Example Sentences They aim to undetermine the strict rules. Synonyms uncertain; vague; ambiguous Antonyms determine; clarify; define Hear It! Say It! Write It! undetermine Switch to cursive Start Share with your friends: