How to use "uncertain" in a sentence

But neither can two great and powerful groups of nations take comfort from our present course - both sides overburdened by the cost of modern weapons, both rightly alarmed by the steady spread of the deadly atom, yet both racing to alter that uncertain balance of terror that stays the hand of mankind's final war.

He moved his feet nervously, uncertain of what to say at first

She waits for a moment, uncertain, and then she takes a breath

He walks back up the stairs feeling confused and uncertain

Sala's mom looked uncertain

but on the other, her life with Cham had never felt more uncertain.

'Well,' I said, 'things are a little uncertain.'

This gave people confidence and as darkness fell, a slow, uncertain movement on the common began

I moved slowly because I was very tired and my plans were uncertain