witless

adjective

unreasonable/foolish/heedless (not guided by reason, lacking wisdom/sense)

Wiktionary

adj

Etymology: From Middle English witles, from Old English witlēas (“senseless; witless”), from Proto-Germanic *witjalausaz (“witless”), equivalent to wit + -less. Cognate with Swedish vettlös (“senseless; witless; wild”), Icelandic vitlaus (“senseless; witless; foolish; mad”).

Lacking wit or understanding; foolish.
“Then will we march to all thoſe Indian Mines, My witleſſe brother to the Chriſtians loſt: And ranſome them with fame and vſurie.”
“To be his whore, is witles; Out upon't;”
Indiscreet; not using clear and sound judgment.
Mindless, lacking conscious thought or the capacity for it.
“Rage warps my clearest cry To witless agony.”