im·prop·er 
/ɪmˈprɑ:pɚ/ adjective
/ɪmˈprɑ:pɚ/ adjective [more improper; most improper] : not proper, right, or suitable: such as a : not correct
▪ The doctor gave him an improper diagnosis. ▪ improper grammar
b : not following rules of acceptable behavior : legally or morally wrong
▪ They claim to have evidence of improper police conduct. ▪ improper use of public land
c : not suitable for the situation : not appropriate
▪ This is an improper diet for a growing teenager. ▪ improper dress/attire
d : not polite
▪ It would be improper for me to ask such a favor of her. ▪ He made some improper remarks. ▪ improper behavior
▪ The doctor gave him an improper diagnosis. ▪ improper grammar
b : not following rules of acceptable behavior : legally or morally wrong
▪ They claim to have evidence of improper police conduct. ▪ improper use of public land
c : not suitable for the situation : not appropriate
▪ This is an improper diet for a growing teenager. ▪ improper dress/attire
d : not polite
▪ It would be improper for me to ask such a favor of her. ▪ He made some improper remarks. ▪ improper behavior
— im·prop·er·ly adverb
▪ He came to school improperly dressed. ▪ She pronounced the word improperly. ▪ behaving improperly
▪ He came to school improperly dressed. ▪ She pronounced the word improperly. ▪ behaving improperly
