Antonyms of adj allergic

1 of 2 senses of allergic

Sense 2
allergic, hypersensitive, hypersensitized, hypersensitised, sensitized, sensitised, supersensitive, supersensitized, supersensitised -- (having an allergy or peculiar or excessive susceptibility (especially to a specific factor); "allergic children"; "hypersensitive to pollen")

INDIRECT (VIA susceptible) -> unsusceptible, insusceptible -- (not susceptible to)

Similarity of adj allergic

2 senses of allergic

Sense 1
allergic -- (characterized by or caused by allergy; "an allergic reaction")

Sense 2
allergic, hypersensitive, hypersensitized, hypersensitised, sensitized, sensitised, supersensitive, supersensitized, supersensitised -- (having an allergy or peculiar or excessive susceptibility (especially to a specific factor); "allergic children"; "hypersensitive to pollen")
       => susceptible (vs. unsusceptible) -- ((often followed by `of' or `to') yielding readily to or capable of; "susceptible to colds"; "susceptible of proof")