(a.) Having a capacity or tendency to expand or dilate; diffusive; of much expanse; wide-extending; as, the expansive force of heat; the expansive quality of air.

accessible affable airy all jaw all-embracing all-inclusive amiable ample amplitudinous approachable big bouncy broad buoyant candid capacious chatty commodious communicable communicative comprehensive conversable conversational copious deep demonstrative dilatable dilatant distensive easy effervescent effusive elastic enlarging expandable expanding expansible expansile expansional extendable extended extending extensible extensile extensional extensive extroverted far-reaching flip fluent frank free free-speaking free-spoken free-tongued friendly full gabby garrulous gassy generous genial glib gossipy great gregarious gushy infinite inflatable inflationary large lavish liberal long-winded loquacious multiloquent multiloquious newsy open openhanded outgoing outspoken overtalkative prolix resilient roomy scopic self-revealing self-revelatory smooth sociable spacious spreading talkative talky unconstrained unhampered unrepressed unreserved unrestrained unrestricted unreticent unsecretive unshrinking unsilent unsuppressed vast verbose volatile voluble voluminous warm wide wide-ranging widespread windy