The answer is "Conversation"
Sérieux (if what you are talking about is masculine) or serieuse (if what you are talking about is feminine)
Je m'ennuie de vous parler is i miss talking to you in french!
Ciel
hoiunnyt becoduu
Tu es incompétent if you are talking to a man Tu es incompétente if you are talking to a woman
"Plus tranchant" talking of a knife
I'd probably say : "Courage !".
talkative is 'bavard' in French. That hints that someone is talking too much.
They say tu for one person, but if they are talking to a group of people, like the teacher talking to the class, they say vous, but saying vous is polite.
Elle parlait de toi
je parle à des amis
Il peut être malsain