arisco - surly, unfriendly, gruff,...
  el codillo - upper foreleg (of a four-legged...
  obseso - obsessive, obsessed
  ojeroso - having bags under the eyes, haggard
  la pajarita - bow tie, paper bird
  esférico - spherical
  la pieza - piece, part, portion, room of a building
  el nacimiento - birth, origin, beginning, source,...
  la ecuación - equation
  la guerra - war, struggle, conflict
  inalámbrico - cordless, wireless
  proscrito - banned, banish, proscribed
  el franqueo - postage
  el filo - edge (especially of something, such...
  el bufón, la bufona - buffoon, silly person, stupid person,...