Antonyms of adj impressionable

1 sense of impressionable

Sense 1
impressionable (vs. unimpressionable), waxy, impressible -- (easily impressed or influenced; "an impressionable youngster"; "an impressionable age"; "a waxy mind")

unimpressionable (vs. impressionable) -- (not sensitive or susceptible to impression; "an unimpressionable mind")

Similarity of adj impressionable

1 sense of impressionable

Sense 1
impressionable (vs. unimpressionable), waxy, impressible -- (easily impressed or influenced; "an impressionable youngster"; "an impressionable age"; "a waxy mind")
       => easy -- (readily exploited or tricked; "an easy victim"; "an easy mark")
       => spinnable -- (capable or susceptible to being influenced by biased information)
       => plastic, pliant -- (capable of being influenced or formed; "the plastic minds of children"; "a pliant nature")
       => susceptible -- (easily impressed emotionally)