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We've been unsuccessful.

Our plan was unsuccessful.

Tom seemed unsuccessful.

Tom was unsuccessful.

We were unsuccessful.

I gather you were unsuccessful.

All his endeavors proved unsuccessful.

He commented on his unsuccessful business negotiation.

The attempts were for the most part unsuccessful.

If I don't come back, the venture will probably be unsuccessful.

Act like you were from those we can not quickly make a maker of unsuccessful ones.

We tried to put out the fire but we were unsuccessful. We had to call the fire brigade.