1.   A formidable opponent, I suspect.

2.   Durable Free State prop Piet Bester has proved a technically formidable opponent.

3.   In debate he was a formidable opponent.

4.   In debate, he was a formidable opponent.

5.   Manchester United will prove a formidable opponent this season.

6.   She had no vision of money as an independent power, or a formidable opponent.

7.   The character who can maintain such an idea is a formidable opponent to established order.

8.   The team faces some formidable opponents in the next week.

9.   He remained a formidable opponent.

10.   She is a formidable opponent in the race for senator.