different between unimpressible vs stolid

English

un- +? impressible

unimpressible (comparative more unimpressible, superlative most unimpressible)

unimpressible in The Century Dictionary, New York, N.Y.: The Century Co., 1911.

From Middle French stolide, from Latin stolidus (“foolish, obtuse, slow”).

stolid (comparative stolider, superlative stolidest)

Having or revealing little emotion or sensibility; dully or heavily stupid.
- 1898, H.G. Wells, The Time Machine, Chapter V ,
  They (Eloi) all failed to understand my gestures; some were simply stolid, some thought it was a jest and laughed at me.

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