IPA: /ˈsʌnɪnəs/
KK: /ˈsʌnɪnəs/
The quality or state of having a lot of sunlight or being bright and cheerful.
The sunniness of the day made everyone feel happy and energetic.
Sunniness → It is formed from "sun" (from Old English *sunne*, meaning the star that provides light and warmth) and "-ness" (meaning the state or quality of). The word "sunniness" refers to the state of being sunny or having sunlight.
Think of the word 'sun' representing light and warmth, and remember that 'sunniness' means the quality of having that sunlight.