Antonyms of adj susceptible

2 senses of susceptible

Sense 1
susceptible (vs. unsusceptible) -- ((often followed by `of' or `to') yielding readily to or capable of; "susceptible to colds"; "susceptible of proof")

unsusceptible (vs. susceptible), insusceptible -- (not susceptible to)
        => immune, resistant -- (relating to or conferring immunity (to disease or infection))
        => immunized, immunised, vaccinated -- (having been rendered unsusceptible to a disease)
        => immunogenic -- (possessing the ability to elicit an immune response)
        => incapable (predicate) -- (not being susceptible to or admitting of something (usually followed by `of'); "incapable of solution")
        => unpersuadable, unsuasible -- (not susceptible to persuasion)
        => unresponsive -- (not susceptible to suggestion or influence)

Sense 2
susceptible -- (easily impressed emotionally)

INDIRECT (VIA impressionable) -> unimpressionable -- (not sensitive or susceptible to impression; "an unimpressionable mind")

Similarity of adj susceptible

2 senses of susceptible

Sense 1
susceptible (vs. unsusceptible) -- ((often followed by `of' or `to') yielding readily to or capable of; "susceptible to colds"; "susceptible of proof")
       => 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")
       => amenable -- (open to being acted upon in a certain way; "an amenable hospitalization should not result in untimely death"; "the tumor was not amenable to surgical treatment")
       => capable, open, subject -- (possibly accepting or permitting; "a passage capable of misinterpretation"; "open to interpretation"; "an issue open to question"; "the time is fixed by the director and players and therefore subject to much variation")
       => convincible, persuadable, persuasible, suasible -- (being susceptible to persuasion)
       => fictile, pliable -- (susceptible to being led or directed; "fictile masses of people ripe for propaganda")
       => liable (predicate), nonimmune, nonresistant, unresistant -- ((often followed by `to') likely to be affected with; "liable to diabetes")
       => predisposed -- (made susceptible; "because of conditions in the mine, miners are predisposed to lung disease")
       => amenable, tractable -- (readily reacting to suggestions and influences; "a responsive student")
       => suggestible -- (susceptible or responsive to suggestion; "suggestible young minds")
       => temptable -- (susceptible to temptation)
       => unvaccinated -- (not vaccinated)
       => vulnerable -- (susceptible to criticism or persuasion or temptation; "vulnerable to bribery"; "an argument vulnerable to refutation")
          Also See-> sensitive#1; unprotected#1; vulnerable#1

Sense 2
susceptible -- (easily impressed emotionally)
       => impressionable (vs. unimpressionable), waxy, impressible -- (easily impressed or influenced; "an impressionable youngster"; "an impressionable age"; "a waxy mind")