improper

Used to emphasize that something is very improper.

Used to mean 'fairly' or 'to some degree' improper.

Used to emphasize that something is extremely improper; a strong and somewhat formal term.

Used to state that something is improper.

Used to suggest that something appears to be improper.

To have the opinion that something is improper.

To think of something as improper, often in a formal context.

To believe something is improper.