IPA: //pəʊˈɛtɪkəl.nəs//
KK: /ˈpoʊɪtɪkəlnəs/
The quality or state of being related to poetry or having poetic qualities.
The poeticalness of her writing captivated the audience.
Poeticalness → It is formed from "poet" (from Old French *poete*, meaning a maker or creator) and "-ical" (meaning pertaining to) and "-ness" (meaning the state of being). The word "poeticalness" refers to the state of being poetic or having qualities characteristic of a poet.
Think of a 'poet' as someone who creates beautiful words, and when you add '-ical' for pertaining to and '-ness' for state, it helps you remember that 'poeticalness' means the state of being poetic.