lowbrow vs lowbrowed

lowbrow is a noun but lowbrowed is not a noun.

Word	Noun	Adjective	Verb	Adverb
lowbrow	Yes	Yes	No	No
lowbrowed	No	Yes	No	No

As adjectives, lowbrow and lowbrowed are synonyms defined as:

lowbrow and lowbrowed: characteristic of a person who is not cultivated or does not have intellectual tastes

Other synonyms of lowbrow include uncultivated.

lowbrow (noun)	lowbrowed (noun)
a person who is uninterested in intellectual pursuits

lowbrow (adjective)	lowbrowed (adjective)
characteristic of a person who is not cultivated or does not have intellectual tastes	characteristic of a person who is not cultivated or does not have intellectual tastes