无礼的举动
rude behaviour
Was that bad form then, leaving so early? 那么，这么早离开失礼吗？
It's generally considered bad form to brag about your achievements.
We didn't want to arrive late - it would have been very bad form.
He certainly wouldn't have asked her age if he had known doing so was extremely bad form.
My grandmother thought it was bad form to read anything at the table.
See also: form noun (BEHAVIOUR)