There are 2 solutions. The longest is IMPERMEABLE with 11 letters, and the shortest is IMPERVIOUS with 10 letters.
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No, "NOT ALLOWING LIQUID TO PASS THROUGH" hasn´t seen a spike right now. Solvers are most interested in: Aberrations, Concise, Is patient, Standard and Words to a backstabber.
Solutions are between 10 and 11 letters long.