ungentlemanly

see unmasculine for an explanation of the subjective cultural meanings attached to this word. Define what you mean by ungentlemanly in precise terms: impolite, crude, rude, insensitive, thoughtless, discourteous, poorly behaved, ill-mannered, uncivil, disagreeable, inconsiderate. These adjectives (which can apply equally well to women) are not synonyms for ungentlemanly but rather reflect the way this word is most often used.