But his eyes held a ruthless dedication which betrayed his true nature.

To save me from embarrassment, you betrayed your real nature to me.

He was betraying the realities, but not his nature.

When in human form they will always have a feature which betrays their nature, though it may be carefully concealed.

Yet he did not want to betray his real nature by being open about that.

Then there were times when I betrayed my nature in a particular and spontaneous way.

But the systems connected to this device betray its true nature.

How could I make a place for myself in the child's household without betraying my true nature?

I do not think that Islam will betray its own nature in this way.

Little things betray a boy's nature, or a man's, for that matter.