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To add to the already excellent answer, you do not need to describe body language every time, you can clearly state the subtext directly as the narrator. He leaned in and lowered his voice, all...
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Source: https://writers.stackexchange.com/a/41769 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
To add to the already excellent answer, you do not need to describe body language every time, you can clearly state the subtext directly as the narrator. > He leaned in and lowered his voice, all his body screaming hatred towards her. All of our body language is unconscious, you don’t realise you’re doing it or reading it so even if you describe it perfectly, people may not get it anyway.