Normally with singular concord for the singular form, however JLA targumim follow a pattern in which concord with an adjective is almost always in the singular, but with a verb it is treated as a plural.
  
Page refs. in other dictionaries: DJPA: 410a; DJBA: 869b; Jastrow: 1086; Levy Ch-W: 2:222; Tal Sam: 644; DNWSI: 864; DJA: 71a; Cook,Qumran: 183;

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Derivatives:

byt ˁm, byt ˁmˀ n.m.   public hall

br ˁmmyn n.m.   gentile

ˁm dˀrˁ, ˁm ˀrˁˀ n.m.   common person

ˁmm n.m.   gentile, non-Jew

ˁmmy (ˁamməmāy) adj.   gentile