Blockheadedly

Part of speech: adverb

Definitions

1. In a way that reveals a deficiency in cleverness or awareness
2. Acting in a way that shows an unwillingness to understand or consider others' ideas
3. Behaving in a fashion marked by persistent dullness or lack of insight

Etymology: "Blockheadedly" is simply the adverb form of "blockheaded," built by adding the suffix "-ly" to that adjective. "Blockheaded" itself combines "blockhead," a compound of "block" (a solid piece of wood, the sense of something dull and unresponsive) and "head," with "-ed" turning the noun into an adjective meaning having such a head. The suffix "-ly" is the common English way of turning an adjective into an adverb describing manner, so the word describes acting in the manner of someone with a blockhead.