Full of activity or motion; characterized by being constantly active or busy.
From Latin 'actuosus,' formed from 'actus' (deed) plus the suffix '-osus' (full of). This rare English adjective followed Romance language patterns for expressing abundance or fullness of a quality.
You rarely see this word anymore, but it's a beautiful example of how English borrowed adjective-forming patterns from Latin—the '-osus' ending became '-ous' in English, which is why 'ambitious,' 'famous,' and 'generous' all have that same pattern.
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