lachend
laughing
Describes a person or action accompanied by laughter. It expresses that someone is laughing while doing an activity.
Lachend kam sie auf mich zu und umarmte mich.
Laughing, she came up to me and hugged me.

laughing
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laughing
Describes a person or action accompanied by laughter. It expresses that someone is laughing while doing an activity.
Lachend kam sie auf mich zu und umarmte mich.
Laughing, she came up to me and hugged me.

'Lachend' (laughing) is the present participle of the verb 'lachen' (to laugh). It describes an action that takes place at the same time as another action.
Das Kind rannte lachend über die Wiese.
The child ran laughing across the meadow.
'Lachend' (laughing) can describe an action as an adverb and then remains unchanged. But it can also stand before a noun like an adjective and is then declined.
Lachend erzählte er einen Witz.
Laughing, he told a joke.
In the meaning of 'looking cheerful,' 'lachend' (laughing) is often used in fixed combinations, for example 'lachende Augen' (laughing eyes), 'ein lachendes Gesicht' (a laughing face), or, poetically, 'die lachende Sonne' (the laughing sun).
Sie hat so freundliche, lachende Augen.
She has such friendly, laughing eyes.
serious
'ernst' and 'lachend' can describe opposite facial expressions or opposite moods. Here, 'ernst' means that someone is not laughing and seems rather calm or thoughtful. 'lachend' means that someone is laughing during an action or looks cheerful. 'ernst' is more suited to important conversations or moments of concentration, while 'lachend' is more suited to joy, fun, or a relaxed situation.

Ida kommt lachend ins Büro und erzählt von ihrem schönen Morgen.
Ida comes into the office laughing and talks about her lovely morning.
Vor der Besprechung sieht er ernst aus, obwohl die anderen schon scherzen.
Before the meeting, he looks serious, even though the others are already joking.