What is an adverb for laugh?

There isn't a single perfect adverb for "laugh" because the way someone laughs can be described in many ways. Here are some adverbs you could use depending on the context:

To describe the sound:

* Loudly

* Softly

* Heartily

* Merrily

* Hysterically

* Contagiously

* Forcefully

To describe the feeling:

* Joyfully

* Happily

* Sorrowfully (for a bitter or ironic laugh)

* Embarrassedly

* Nervously

To describe the manner:

* Awkwardly

* Uncontrollably

* Sarcastically

* Teasingly

Examples:

* She laughed loudly at the joke.

* He laughed softly to himself.

* The children laughed merrily at the clown.

* She laughed nervously when he asked her out.

* They laughed sarcastically at his attempt.

The best adverb to use depends on the specific situation and the emotion you want to convey.