suffocatingly

adv

1. In a suffocating manner, or to a degree that suffocates

   “The hall was suffocatingly crowded.”

   “[...] then, after about ½-mile of level through Pilning the climb is resumed at 1 in 100 for another three miles, including over a mile through a suffocatingly smoky single line tunnel (the down line being on a different and steeper location) to Patchway station.”