gulfiest

/ˈɡʌlfiɪst/
adjective
  1. Superlative form of gulffy; most like a gulf, or having the deepest or widest gaps or differences.
    • That was the gulfiest chasm we had ever seen.
    • Among all the disagreements, this one was the gulfiest.
    • The gulfiest part of the ocean is still unexplored.