unfoolable

adj

unfoolable

adj

Etymology From un- + foolable.

1

Impossible to fool, not foolable.

Then what can be the reason, without it is just a grim jest being played on the most unfoolable bird in the bush?1934, Henry G. Lamond, An Aviary On The Plains, page 206:

Entry derived from the Wiktionary, under licence CC BY-SA 4.0 — list of authors.