反义词

a.   impressible，impressionable

参考例句

1. Before they had gone far it occurred to the perspicacious reddleman that he would have acted more wisely appearing less unimpressionable.
他们没走多远，那位见事犀利的红土贩子就忽然想到，他要是作出容易受感动的样子来，那他的行动就显得更聪明了。

英英解释

adj.
  1. not sensitive or susceptible to impression