generated at
smile
source: [ご注文はうさぎですか?の保登心愛がにっこり笑顔なGIF画像|無料GIF画像検索 GIFMAGAZINE 703983]

point 笑う
laughlaugh : 声を立てる笑いを表す一般的な語で, 幸せや面白さを感じて笑う場合に用いるが, 人を馬鹿にして笑うことも表す
smile smile : 声を立てずにっこりほほ笑んで, 喜びや友好を表すが, 笑顔で承認や激励を表現する場合にも用いられる
grin grin : 歯を見せてにやりと笑うことを指し, 軽蔑・悪意を表現することも可能
giggle giggle : 子供や女性が可笑しさ恥ずかしさから, 高い声で繰り返し笑う場合に用いる
chuckle chuckle : 〘主に書〙 で, 笑いを隠そうとしてくっくっと笑うことを表し, 男性が主語となることが多い
sneer sneer : 敬意を払わず, 人を見下して冷笑するときに使い, 〘主に書〙 で好まれる

verb no object
form one's features into a pleased, kind, or amused expression, typically with the corners of the mouth turned up and the front teeth exposed:
〈人が〉 «…に/…して» ほほえむ, 微笑する, にっこりする «at, on, upon, for/to do»
e.g. she was smiling
e.g. he smiled at Shelley
e.g. (as adjective smiling) : smiling faces.
with object express (a feeling) by smiling:
〈気持ち〉をほほえんで示す; ⦅書⦆ 〖直接話法〗にっこり笑って…と言う
e.g. he smiled his admiration of the great stone circle.
(smile at/on/upon) regard favorably or indulgently:
⦅主に文⦆ «…に» 〈運などが〉向く, 〈幸運・神などが〉ほほえみかける, 恵みをたれる «on, upon»
e.g. at first fortune smiled on him.
(often as adjective smiling) literary (especially of landscape) have a bright or pleasing aspect:
⦅詩/文⦆ 〈主に風景が〉輝いている, 心地よい趣がある
e.g. smiling groves and terraces.

noun
a pleased, kind, or amused facial expression, typically with the corners of the mouth turned up and the front teeth exposed:
ほほえみ, 微笑, 笑顔(→ laugh)
e.g. he flashed his most winning smile
e.g. she greeted us all with a smile.

PHRASES
informal (of a person) look very cheerful and pleased, especially in contrast to a previous mood.

informal recover from adversity and cheerfully face what is to come.

DERIVATIVES
smiler |ˈsmīlər| noun
smilingly |ˈsmīliNGlē| adverb

ORIGIN
Middle English: perhaps of Scandinavian origin; related to smirk.