reason

The reason is this.

oppose reason to force

There is no reason to doubt the veracity of the evidence.

Angry for no apparent reason;

for no apparent reason she laughed.

the reasoning behind their decisions.

too heady to reason with.

we have reason to celebrate.

prudential reasons for an act

Man is a reasoning creature.

the reason for being late

use reason to solve problems

reason whether it is right

wouldn't yield to reason;

There's no earthly reason for me to go.

There was no obvious reason for the accident.

to reason a person out of fear

You have no reason to complain.

I demand a reason for this interruption.