Superlative form of clammy: most clammy.(adjective)
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Use "clammiest" in a sentence
"At sushi shops, they went for the clammiest fish eggs."
"Mr. Waples had no time to reply, for a large bubble of carbonic acid gas burst at that moment, and blew him through the gap or "fault" of the rock, into the coldest and clammiest cavern he had ever trodden."
"Strikingly, it's also a comedy club reference -- because that is of course the source of the clammiest clams."