In a companionable manner; in a friendly, pleasant way suited to good company.
From companionable + -ly (adverb marker). Transforms the adjective into an adverb describing how an action is performed or how people interact.
The adverb companionably helps describe a quality of interaction that modern English is losing—it suggests a whole aesthetic of being together slowly, pleasantly, without agenda, the way Victorian writers described sitting in silence with a valued friend.
Complete word intelligence in one call. Free tier — 50 lookups/day.