like a gentleman
彼の礼儀は紳士らしくない。
His manners are not gentlemanly.
紳士らしく彼は立って自分の席を彼女に勧めた。
Like a gentleman, he stood up and offered her his seat.
私は紳士らしく正装して船と運命を共にする
I'll go down with the ship in full formal attire, like a gentleman.
— タイタニック (1997)