Enjoyable to be around; friendly and suited to pleasant social interaction or companionship.
From companion + -able (capable of). The word emerged in Early Modern English as a way to describe people who were good company, gradually becoming the standard form over variant spellings.
Companionable is the kind of word that feels old-fashioned but perfectly precise—it means not just friendly, but specifically the kind of person whose presence improves a group, someone you actively want spending time with you, which is more specific than just 'nice.'
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