behavioural Get Printable Handwriting Hear It! Say It! Write It! Learn It! Spelling Test Definition adjective. related to the way a person acts. Example Sentence A behavioural adaptation is when an organism changes behavior to survive. More Example Sentences Behavioural patterns can be learned or changed. Synonyms conduct; actions; demeanor Antonyms nonliving Hear It! Say It! Write It! behavioural Switch to cursive Start Share with your friends: