is similar to
of low birth or station (`base' is archaic in this sense)
"baseborn wretches with dirty faces"; "of humble (or lowly) birth"
is similar to
of or associated with the great masses of people
"the common people in those days suffered greatly"; "behavior that branded him as common"; "his square plebeian nose"; "a vulgar and objectionable person"; "the unwashed masses"
is similar to
not of the nobility
"of ignoble (or ungentle) birth"; "untitled civilians"
see also
occupying the lowest socioeconomic position in a society