teterrimous

From Latin teterrima (“most foul, most ugly”).[1]

teterrimous (comparative more teterrimous, superlative most teterrimous)

1. (rare) Extremely foul or ugly; horrible; terrible.
   • 1854, Edward Michael Whitty, The Derbyites and the Coalition: Parliamentary Sketches, Trübner & Co. (1854), page 128:

     Captain Magan, the teterrimous occasion of the wars of the week, enters battle in a red shirt!

   • 1885, The Royal River: The Thames, From Source to Sea, Gresham Books Limited (1983), →ISBN, page 194:

     Halliford Bridge was washed away some years ago by the floods; and now the Surrey and Middlesex shores are connected by a brick and iron structure which is named Walton Bridge, and which, being the teterrimous cause of war between Bumbledon on both sides the river, was painted of two colours, a chromatic difference that greatly increased the normal ugliness of the design.

   • 2009, Daniel A. Rabuzzi, The Choir Boats, Chizine Publications (2012), →ISBN, unnumbered page:

     On the very edge of sight the teterrimous mountains, huge, made of brass, scaling the dark heavens, rimmed with blue flames.