Far from it
Definition 1 of 2
Pro Tip 1/3Emphasizing Negation
Used to stress that the reality is the opposite of what was mentioned. 
Is this the easy solution? Far from it, it's quite complex.
Pro Tip 2/3Expectation Contrast
Highlights a strong contrast between expectation and reality. 
A genius at work? Far from it, he struggles with the basics.
Pro Tip 3/3Sarcasm Indicator
Can introduce a sarcastic comment by opposing a false assumption. 
He's the picture of health, far from it—he smokes like a chimney.