EntryCommonJLPT N3
  1. Adverb (fukushi), Adverb taking the 'to' particle, Suru verb

    sweetly (smiling); broadly (grinning)

    Onomatopoeic or mimetic wordsee ニコニコ

    彼女は私を見てにこりとさえしなかった。
    She did not so much as smile at me.

Also written ニッコリにこりニコリ

Pitch on OJAD