[a little elbow grease]

Frank Sinatra blazed the path to obtuseness.

_________

Your comment about Frank is ABSURD.

Synonyms for obtuseness ---- boneheadedness, brainlessness, denseness, density, dim-wittedness, doltishness, dopiness, dorkiness, dullness.

Learn the language before you use a word about Sinatra in that context, genius.

[sparklite2]

Boneheadedness as in stubbornly continuing to sell a product long past its ‘sell-by’ date.