1. ambivalent /æmˈbɪvələnt/= not sure whether you want or like something or not ambivalent about 

We are both somewhat ambivalent about having a child.

ambivalent attitude/feelings etc 

—ambivalence noun [singular, uncountable] 

O'Neill had a genuine ambivalence toward US involvement in the war.

—ambivalently adverb

2. rapport =friendly agreement and understanding between people → relationship

rapport with/between He had an excellent rapport with his patients.

establish/build up/develop (a) rapport He built up a good rapport with the children.

3. hysterical= 

01 unable to control your behaviour or emotions because you are very upset, afraid, excited etc 

Janet became hysterical and began screaming. 

Everyone in the studio burst into hysterical laughter.

02 informal extremely funny SYN hilarious 

It was absolutely hysterical! I’ve never laughed so much.

—hysterically /-kli/ adverb