That he should be uncertain on the point was ridiculous.

The field of color psychology is uncertain on the matter.

However, some scientists have said that the study's conclusions seemed uncertain on the basis of data disclosed so far.

The most ancient writings that I have studied are uncertain on so many points.

"It's uncertain on the basis of the gross "Nothing clear at all.

Some of the things he'd seen so far today had made him a bit uncertain on the subject.

"I never even saw him after you pushed-" Her eyes were uncertain on his face.

He had felt uncertain on the the 1-iron from the fairway, and now he hit behind the 8-iron.

"They've been living in low gravity for six years, while you still seem a little uncertain on your feet."

He died at the age of 76, but it is uncertain on which of two separate dates.