IPA: /ˈspɪf.i.nəs/
KK: /ˈspɪfɪnəs/
The quality of being stylish, neat, or attractive in appearance.
The spiffiness of his new suit impressed everyone at the party.
Spiffiness is derived from the word 'spiffy' (originating from the 19th century British slang, possibly related to 'spiff', meaning stylish or smart) and the suffix '-ness' (meaning the state or quality of). The term 'spiffiness' refers to the quality of being stylish or smart in appearance.
Think of 'spiffy' as meaning stylish, and remember that 'spiffiness' describes the quality of being stylish.