ultracrepidarian

Etymology
From, attributed to who used it in a letter to  (see below). The reference is to a story concerning the painter, who supposedly placed new works on public display and hid behind them to hear and act upon people's reactions. In Book 35 of his Natural History, records that a shoemaker noted that one figure had the wrong number of straps on his crepida, a kind of elaborate sandal. Delighted to see it fixed the next day, he supposedly began to critique the form of the leg, so annoying Apelles that the painter came out to tell him to mind his own business: that a shoemaker should restrict his commentary to the shoes. This became a Latin proverb as.

Adjective

 * 1)  Giving opinions on something beyond their knowledge or expertise.

Translations

 * Finnish: asiantuntematon
 * Spanish: todólogo

Noun

 * 1)  One who gives opinions on something beyond their knowledge (a person passing judgment beyond their expertise).