massive (adj.)

• adamantine
• astronomical
• awesome
• awkward
• big
• boundless
• bulky
• bullnecked
• burdensome
• close
• close-knit
• clumsy
• coarse
• colossal
• compact
• compressed
• concentrated
• concrete
• congested
• consolidated
• corpulent
• cosmic
• cracking
• crass
• crowded
• cumbersome
• cumbrous
• dense
• durable
• elephantine
• enduring
• enormous
• extensive
• fantastic
• fat
• firm
• full
• full-bodied
• galactic
• gargantuan
• gigantic
• gluey
• grand
• gross
• hard
• heavy
• heavyset
• hefty
• huge
• hulking
• hulky
• humongous
• immeasurable
• immense
• impenetrable
• impermeable
• incumbent
• infinite
• jam-packed
• jammed
• jumbo
• king-size
• large
• lasting
• leaden
• lubberly
• lumbering
• lumpish
• lumpy
• mammoth
• mighty
• monstrous
• monumental
• mortal
• mountainous
• nonporous
• onerous
• oppressive
• outsize
• overgrown
• oversized
• overweight
• packed
• ponderous
• prodigious
• rugged
• serried
• sizable
• solid
• sound
• spacious
• stable
• steady
• stout
• strong
• stupendous
• sturdy
• substantial
• superincumbent
• thick
• thick-bodied
• thickset
• three-dimensional
• titanic
• tough
• towering
• tremendous
• unwieldy
• unyielding
• vast
• viscid
• viscous
• voluminous
• walloping
• weighty
• well-founded
• well-grounded
• well-made
• whopping