leachiest

/ˈlitʃiɪst/
adjective
  1. Most capable of allowing liquid to pass through; most porous or permeable.
    • The leachiest part of the old dam was where the water seeped through most quickly.
    • The leachiest soil in the garden drained water almost instantly after a heavy rain.
    • Among all the fabrics tested, the leachiest one was the loose-weave cotton.
Antonyms
What does "leachiest" mean? | whatsthatwordmean | whatsthatwordmean