What's the adjective for moistest? Here's the word you're looking for.
Included below are past participle and present participle forms for the
verbs moisten, moisturize, moisturise, moistify and moistureproof which may be used as adjectives within certain contexts.
moist
Slightly wet; characterised by the presence of moisture, not dry; damp. [from 14th c.]
(sciences, now historical) Pertaining to one of the four essential qualities formerly believed to be present in all things, characterised by wetness. [from 14th c.]