It's not ordinary "fear" - we can be frightened and still behave reasonably.
An employer complaining about your performance ought to behave reasonably.
No man now can trust himself to behave reasonably.
In his experience, whenever they started behaving reasonably, they were up to something.
Behaving reasonably has always been a goal as opposed to a fact of life.
The trouble is that at least in this version of history the Russians behave reasonably.
If a person had vision, he could behave reasonably.
It was all I could do to keep them reasonably well behaved until the hour of departure.
I had always thought if I was right and behaved reasonably that the government would be on my side.
It has proved incapable of behaving reasonably throughout this disastrous affair.