IMPERVIOUSNESSimperviousness · English · Reference checkedReferenceOpen English WordNet 2024oewn2024:lemma:IMPERVIOUSNESSTier 1Ordinal204Pythagorean69Classical193Reverse174Reverse Reduction84Standard588Final Large588Ordinal147Reduced57Atbash372Isopsephy1372Ordinal193Abjad586