adverb, adverb taking the 'to' particle
with bright, wide-open eyes
Describes eyes that are large, clear, and wide open, often with a sense of innocence or alertness. Typically used with 目 or 瞳.
その子はきょろりとした大きな目でこちらを見ていた。
The child was looking this way with big, bright, wide-open eyes.
adverb, adverb taking the 'to' particle
Describes a casual, unconcerned attitude, often in the face of something that would normally cause surprise or worry. Cross-referenced with けろり (sense 2).
See also: けろり
彼は叱られてもきょろりとしている。
Even when scolded, he acts nonchalant.