Improper adjective – Not appropriate for a particular occasion or situation. Two-faced and improper are semantically related. In some cases you can use "Two-faced" instead an adjective "Improper". Nearby Word: improperly
Two-faced adjective – Not being or expressing what one appears to be or express. Improper and two-faced are semantically related. Sometimes you can use "Improper" instead an adjective phrase "Two-faced".