Collocations for stressful - adj.

be, prove, sound
become, get
My job's getting more and more stressful.

find sth
I find these meetings rather stressful.

extremely, fairly, very, etc.
highly
a little, slightly, etc.
emotionally
It was an emotionally stressful time for him.

Stressful is used with these nouns:
condition, environment, event, lifestyle, situation