Sociably is the adverb from sociable. It describes HOW someone does something — in a friendly, easy, wanting-to-be-with-people way. You put it next to a verb: 'they chatted sociably', 'she smiled sociably at the new student', 'he sat sociably with the older workers at lunch'. It is not a common word in daily speech; you meet it more in stories and in careful writing, and it often carries a small warm picture with it — people relaxed together, talking, nobody in a hurry. There is a second, quieter use worth knowing. Sometimes 'sociably' means 'in company, together with others' rather than 'in a friendly manner': 'We drank sociably after work' is less about being warm and more about the fact that it was done with people, as a shared thing, not alone. English speakers slide between those two easily. And notice the small edge the word can carry: because sociably describes the manner and not the heart, a writer can use it to show politeness without warmth — 'he nodded sociably and moved away' tells you he did the friendly-looking thing, and nothing more.

友善地、合群地、和大家一起地。中文常說「和大家有說有笑地」「熱絡地」「隨和地」；有時只是「大家一起（做某事）」，不特別強調親密。