underinclusive

adjective

un·​der·​in·​clu·​sive

ˌən-dər-in-ˈklü-siv

: not sufficiently inclusive : excluding something that should be included

specifically : not affecting others similarly situated with respect to the purpose of the law and especially in violation of equal protection

an underinclusive classification

all four ordinances are overbroad or underinclusive in substantial respects

—Church of the Lukumi Babalu Aye v. City of Hialeah, 508 U.S. 520 (1993)

compare overinclusive

underinclusiveness noun