unfoolable

English

Etymology

un- +‎ foolable

Adjective

unfoolable (not comparable)

  1. Impossible to fool, not foolable.
    • 1934, Henry G. Lamond, An Aviary On The Plains, page 206:
      Then what can be the reason, without it is just a grim jest being played on the most unfoolable bird in the bush?
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