adjective, yawn·i·er, yawn·i·est.
Examples from the Web for yawny
But shortly after midnight the giddy revellers begun to thin out and the girl waiters got yawny.Torchy As A Pa|Sewell Ford
Instinctively with his first yawny return to consciousness he reached back under his pillow for Cornelia's letter.Molly Make-Believe|Eleanor Hallowell Abbott
They were all yawny, and some were grumpy, but I had washed my being in the sunrise and felt as blithesome as the day.Lucy Maud Montgomery Short Stories, 1905 to 1906|Lucy Maud Montgomery