i think that my sister has behavior problems.
I disapprove of your behavior.
He would always rationalize his bad behavior.
The dog's behavior was perfect.
Because of his behavior, he faced expulsion from school.
To be intemperate is to lack self control. An example sentence would be: His intemperate behavior was making everyone uncomfortable.
I am affronted by your behavior.
you have very bad behaviour.
You could use the word aboniminable in a sentence like this: The boys' behavior was abominable on the school trip, and Alfred's behavior was abominable because he threw a chair at Hector. EDIT: The boys' behavior was abominable on the school field trip because Alfred threw a chair at Hector.
Example sentence - Her behavior was a commendable example for her peers.
Example sentence - We have many examples of good behavior to learn from.
John was appalled by Susie's behavior.
My brother has a unconscionable behavior.