His behaviour wasn't acceptable.
Her behaviour bothered me.
Your behaviour was disgraceful.
I can barely stand annoying behaviours.
He excused her behaviour, knowing she grew up in a different environment.
Adjectives, as the question begins to state, is descriptive words. So...
First I need to buy a red car, that is fast. Next, I want to buy a 42" HDTV, that is thin and sleek. If I have enough money left over, I'm going to buy a fuzzy lava lamp for my living room.
Answer:1. whomever (objective)
Jack hits the ball to whomever has a mitt. (Indirect object)
2. whoever (nominative)
Whoever has a glove can play.
3. who (nominative)
Who is at the door?
4. whom (objective)
Whom did you see when you opened the door?
5. which (nominative/objective)
Which is my slice of pie? (Nominative). The choice boiled down to which came first. (Objective)
6. that (nominative/objective)
That is never an option. (Nominative). I don't think much of that. (Objective)