inactive,
inoperative, unoccupied, at rest, off, still, down, immobile
antonym: working
lazy,
indolent, shiftless, slothful (formal), sluggish, workshy
antonym: diligent
futile,
frivolous, pointless, worthless, useless, vain
unfounded,
baseless, groundless, frivolous, meaningless, speculative, casual
empty,
hollow, ineffectual, impotent, meaningless
laze,
laze around, hang around, sit around, loaf around, goof off (US, informal),
waste, while away, fritter away
tick
over (informal), turn over, run
lay
off (informal), dismiss, can (US, slang), make redundant