Synonyms of 'slouching'
It has to be him. That slouching frame, those long arms.
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An awkward movement or position is uncomfortable or clumsy.
She made an awkward gesture with her hands.
ham-fisted or ham-handed (informal)
unco (Australian , slang)
If you describe a man or a boy as loutish, you are critical of them because their behaviour is impolite and aggressive.
I was appalled by the loutish behaviour.
Thesaurus for slouching from the Collins English Thesaurus