1.   His head hit the door with a sickening thud.

2.   His head hit the floor with a sickening thud.

3.   One pitched out, hitting the ground with a sickening thud.

4.   Then, with a sickening thud in her solar plexus, she understood.

5.   She tripped and fell with a sickening thud.

6.   We heard the squeal of brakes and a sickening thud.

7.   Her heart took up a sickening thud.

8.   And the Mariners went down with a sickening thud.

9.   By the end, Taylor had no life in his legs after absorbing the constant body punches that were delivered to his stomach and ribs with a sickening thud.