Fatuous is an adjective, but also can be used as an adverb, fatuously or a noun, fatuousness. Defined as to be devoid of intelligence, the word fatuous has had the same meaning in English since 1663. Fatuous is derived from the Latin word fatuus (foolish). The word infatuated also derives from the Latin word fatuus and is defined as feeling foolish or obsessively in love with.
Synonyms
Airheaded, dumb
Sentence
Buying a house without negotiating down the price is a fatuous move.
Main source
https://www.merriam-webster.com/dictionary/fatuous
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