source: [ゆるゆりの古谷楓がベンチで考え込むGIF画像｜無料GIF画像検索 GIFMAGAZINE 911207]

a feeling of surprise mingled with admiration, caused by something beautiful, unexpected, unfamiliar, or inexplicable:

驚き, 驚嘆, 驚異(の念) (!surpriseより｟かたく｠ )

e.g. he had stood in front of it, observing the intricacy of the ironwork with the wonder of a child.

the quality of a person or thing that causes wonder:

e.g. Athens was a place of wonder and beauty.

a strange or remarkable person, thing, or event:

驚くべき, 不思議な人, 物, 事

e.g. the electric trolley car was looked upon as the wonder of the age.

as modifier having remarkable properties or abilities:

e.g. a wonder drug.

in singular a surprising event or situation:

e.g. it is a wonder that losses are not much greater.

verb no object

1. desire or be curious to know something:

〖wonder wh節〗 (好奇心･不安･疑いを持って)…かしら(と思う)

e.g. how many times have I written that, I wonder?

e.g. with clause : I can't help wondering how Stasia and Katie are feeling.

with clause used to express a polite question or request:

e.g. I wonder whether you have thought more about it?

2. feel doubt:

〖wonder about A〗 A〈物･事･人〉についておかしいと思う, 怪しむ(doubt), A〈人〉について安否が気になる

e.g. I wonder about such a marriage.

3. feel admiration and amazement; marvel:

e.g. people stood by and wondered at such bravery

e.g. (as adjective wondering) : a wondering look on her face.

be surprised:

〖wonder at A/about A〗 A〈事〉について不思議に思う, 驚く (!コーパスAは〖名詞〗で〖動名〗は｟ややまれ｠ ; Aがwh節の場合はaboutの方が普通)

e.g. if I feel compassion for her, it is not to be wondered at.

informal I think it likely.

it is not surprising:

e.g. it is little wonder that the fax machine is so popular.

an exclamation of great surprise at something pleasing.

have a very beneficial effect on someone or something:

e.g. a good night's sleep can work wonders for mind and body.

something that attracts enthusiastic interest for a short while but is then ignored or forgotten.

(usually ninety-day wonder or thirty-day wonder) a person who has had intensive military training for the specified time.

wonderer noun

wonderingly |ˈwənd(ə)riNGlē| adverb

Old English wundor (noun), wundrian (verb), of Germanic origin; related to Dutch wonder and German Wunder, of unknown ultimate origin.