from Wiktionary, Creative Commons Attribution/Share-Alike License.
superlativeform of unseemly: most unseemly.
Sorry, no etymologies found.
While any sensible person would read this and resolve to stay as far away from the theater as possible, as someone who has made it his life's work to probe the unseemliest recesses of cycling "culture" I knew right away that I had to see this production.
The rollicking tune of it shouted into the night, into the stately stillness that surrounded the old house, had the abruptest, unseemliest effect.