unpractical

I had an Irish cook, an honest woman if ever there was one, faithful, and of a religion as sincere as it was unpractical.

Don Quijote de la Mancha himself could scarcely have made a more pure-intentioned yet more unpractical President.

She is only just out of the schoolroom, you know, and girls are so unpractical.

This time the man was an inventor, and of all unpractical and useless things he had patented an appliance for saving life at sea!

To translate Gozzi with the minute attention to his style which I bestowed upon Cellini would have been unpractical.