able to do blindfolded

able to (do something) blindfolded

Very adept at doing something, with very little or no difficulty; able to complete or accomplish something in a relaxed, carefree, or effortless manner. It took me a little while to get used to this job, but now I'm able do it blindfolded! You should ask Johnny for help, he can do calculus blindfolded.

able to do something blindfolded

and able to do something standing on one's head

Fig. able to do something very easily, possibly without even looking. (Able to can be replaced with can.) Bill boasted that he could pass his driver's test blindfolded.