The definition of shallow is something that is not deep or someone who is concerned only about silly or inconsequential things.(adjective)
See shallow in Webster's New World College Dictionary
Origin: ME shalow < OE *scealw < IE base *(s)kel-, to dry out > shoal, Gr skellein
transitive verb, intransitive verb
See shallow in American Heritage Dictionary 4
adjective shal·low·er, shal·low·est
Origin: Middle English schalowe.
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