na-adjective
Describes weather, mood, voice, or atmosphere as pleasantly bright, clear, and cheerful. Often used in the phrase うららかな春の日 (a bright spring day).
See also: 麗らか (うららか)
今日はうららかな春の日よりだ。
Today is a bright spring day.
彼女
Her cheerful voice echoed through the room.
Synonymous; うららか is the full form, while うらら is a shorter, more literary variant. Both are usually written in kana.
The origin is uncertain; it may be related to classical Japanese うらうら (bright, peaceful). The kanji 麗 is used for its meaning of 'beautiful' or 'bright'.