True locusts, which are actually certain kinds of grasshoppers, are usually solitary and rather sluggish, but when they are crowded they enter a gregarious and highly active migratory phase.
-- Gilbert Waldbauer, Millions of Monarchs, Bunches of Beetles
In the newly discovered gene, the change of a single unit of DNA converts the worm from a solitary forager into a gregarious diner.
-- "Can Social Behavior of Man Be Glimpsed in a Lowly Worm?", New York Times, September 7, 1998
My efforts to cultivate an identity as a strong silent type have consistently been undermined by my gregarious nature and my delight in conversation.
-- Marty Jezer, Stuttering: A Life Bound Up in Words
Origin:
Gregarious is from Latin gregarius, "belonging to a herd or flock," from grex, greg-, "herd, flock."
\grih-GAIR-ee-us\ , adjective;