My only excuse is that I've never felt this way before.

She had lost her mind, that was the only excuse.

That was the only excuse he could find for himself.

That was our only excuse and would hold up in no court I knew.

My only excuse is that I did care for you greatly.

My only excuse can be that I knew no better.

He was the only excuse for a friend I had.

He was a king, and that's the only excuse for him.

The only excuse I can come up with for this game is that it simply wasn't done.

It was the only excuse I had for leaving the gun site at that time.