1. (n.) Extending far and wide; vast in extent.

2. (n.) Inclosing an extended space; having large or ample room; not contracted or narrow; capacious; roomy; as, spacious bounds; a spacious church; a spacious hall.

Gargantuan ample amplitudinous astronomical awesome big boundless broad bulky capacious colossal commodious comprehensive copious cosmic deep enormous expansive extended extending extensive far-reaching full galactic generous gigantic great huge immeasurable immense infinite king-size large mammoth massive massy monster monstrous monumental mountainous outsize outsized overgrown oversized prodigious roomy sizable sizeable spreading stupendous titanic tremendous vast voluminous weighty wide widespread