Mass·y a. [Compar. Massier superl. Massiest.] Compacted into, or consisting of, a mass; having bulk and weight or substance; ponderous; bulky and heavy; weighty; heavy; as, a massy shield; a massy rock.
Your swords are now too massy for your strengths,
And will not be uplifted. --Shak.
Yawning rocks in massy fragments fly. --Pope.