Good-natured, cheerful, and friendly in manner; characterized by bonhomie.
Formed from bonhomie with the suffix -ous (meaning 'full of' or 'characterized by'). This creates an adjective form of the French-derived noun.
This adjective is quite rare in practice because English speakers prefer saying 'having bonhomie' or simply 'good-natured' instead. It's one of those technically correct formations that language just decided it didn't need.
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