You know the routine. Some one says “have a nice day” and then you need something polite to respond back with. In those circumstances I prefer the word, likewise.In print the word has seen a steady decline in popularity since the 1800s.I personally enjoy this word because in part because of its uniqueness. Not only is it not used very often, but it’s a mirror to the sentiment being offered. It’s perfect for most situations. Give it a try.
1400–50; late Middle English; earlier in like wise in a like way.