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Smiling without saying a word or laughing heartily?

According to your description, laughing without saying a word and laughing heartily are two idioms, and they also express two different mental states.

Smiling without saying a word means that a person is smiling on the surface without saying anything or telling you anything, but in fact he knows it very well in his heart. Expressing a state of watching without participating.

Laughing heartily is a kind of unrestrained, untroubled, and very enjoyable laughter. It expresses the state of excitement of the person concerned who is very happy and has no scruples.

Please adopt if you are satisfied.