One is certain and the other in uncertain.
There is no difference between "certain" and "for sure."
Uncertain.
certain Confident
The opposite of uncertain is certain. When something is certain, it is definite, known, or sure, leaving no room for doubt or ambiguity. Certainty implies confidence in the outcome or truth of a situation.
They both mean the same thing.
A term Significant Figure refers to all the certain digits and one uncertain digit in a measurement.
Significant figures represent the precision of a measurement, including all certain digits and one uncertain digit. Decimal places indicate the number of digits to the right of the decimal point. Significant figures are based on the accuracy of the measurement, while decimal places are based on the scale of the number.
There is no difference between "certain" and "for sure."
antonym: uncertain, unsure
uncertain
Uncertain
Uncertain.
uncertain
Not certain; not having certain knowledge; not assured in mind; distrustful., Irresolute; inconsonant; variable; untrustworthy; as, an uncertain person; an uncertain breeze., Questionable; equivocal; indefinite; problematical., Not sure; liable to fall or err; fallible., To make uncertain.
know
Certain and uncertain
The most certain thing is that change is inevitable. Nothing stays the same forever and everything is subject to change. The most uncertain thing is the future. We cannot predict what will happen or how things will unfold, making the future inherently uncertain.