Sentence:  When the flush of a new-born sun fell first on Eden's green and gold, / Our father Adam sat under the Tree and scratched with a stick in the mould; / And the first <WSD>rude</WSD> sketch that the world had seen was joy to his mighty heart, / Till the Devil whispered behind the leaves, "It's pretty, but is it Art?" 
Meaning of the word marked with <WSD> tags:  Undeveloped, unskilled, basic.