Superlative form of shallow: most shallow.(adjective)
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Use "shallowest" in a sentence
"He counted them in his head, even as the shallowest breath she drew acted like a spur to his growing excitement."
"And even the shallowest reader is easily able to read the critique/review critically, i.e., reject it."
"Well, ifyou take the 26% of clueless morons who actually thought Bush was doing a good job at the end of his term and add in another handful of people who think she's "hot" "sassy" or "cute" you have 38% of the shallowest humans possible."