にっこり

adverb, adverb taking the 'to' particle, noun or participle which takes 'suru'

with a sweet smile; with a broad grin

Describes a cheerful, gentle, or pleasant smile, often used with verbs like 笑う or 微笑む. The geminate っ adds a sense of a sudden, bright smile.

See also: ニコニコ

• 彼かの女じょはにっこり笑わらって手てを振ふった。

  She smiled sweetly and waved her hand.