Final answer:
The beginning example of 'Futility (ennui)' in 'The Love Song of J. Alfred Prufrock' is found in the lines that express the fleeting nature of beauty and joy.
Step-by-step explanation:
An example of 'Futility (ennui)' in the poem can be seen in the lines:
'The flowers do fade, and wanton fields.
To wayward winter reckoning yields.
A honey tongue, a heart of gall, Is fancy's spring, but sorrow's fall.'
These lines express the idea that beauty and joy are fleeting, and that life can often be filled with disappointment and sorrow. This sense of futility and ennui pervades the poem, as the speaker grapples with feelings of isolation and the passing of time.