/ˌblɒkˈhɛdɪʃ/(BLOK-hed-ish)

Definitions

1. adjective

excessively stupid or obstinate

“He was known for being blockheadish and refusing to consider alternative solutions to the problem.”

2. adverb

in a stupid or obstinate manner

“She acted blockheadish, refusing to listen to reason and stubbornly insisting on her own way.”