Basic Guidelines For English Spellings
READ THESE ARTICLES
See US English definition of uncertain
See UK English definition of uncertain
See Spanish definition of vacilante
1‘the environmental effects of the project are uncertain’
certain, settled, predictable
2‘the uncertain weather meant that passengers needed to pack a pullover or two’
3‘Edward was a little uncertain about the decision’
certain, sure
4‘I gave her an uncertain smile’
confident