Definition of "unimpressionable" [unimpressionable]

• Not impressionable. (adjective)

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• "Stevens quotes from writers of the time who strenuously objected to the thought that the charming and graceful Ramona could be derived from a race described as "squat," with "straight, coarse black hair, thick lips and high cheek bones," as well as being "dull, heavy and unimpressionable," and "lazy, cruel, cowardly, and covetous.""
• "Ah! what mad desires dashing up against some rock of obstruction or indifference, and flung back again from the unimpressionable granite!"
• "He cannot recognise that this phlegmatic and unimpressionable body with which he now goes burthened, is the same that he knew heretofore so quick and delicate and alive."