As infrequently as the word, "Rivalless," is used, I would think that when I hear someone use the word, they would use it properly. 

Yesterday, driving home from my Mom's, I heard a man on the radio attempt to describe the State of Illinois as, "Rivalless in its ability to spend money it doesn't have..."

I could write a whole essay parsing that comment, but it featured the word Rivalless wrongly. First and foremost, because he didn't use it in the way I have defined it over the last decade; originally with Rivalless Guacamole, and now with,, and Second and most jarringly, his entire conversation was about things that stink. Third, the reason it REALLY stuck with me, he used the word, "Rivalless," and was NOT talking about me or any of my hard work.

.: 100% Airlume combed and ringspun cotton (fiber content may vary for different colors)
.: Light fabric (4.2 oz/yd² (142 g/m²))
.: Retail fit
.: Tear away label
.: Runs true to size

Ri-val-less Definition Shirt