Efficient

Synonyms for efficient
adj adept, effective

profitable
productive
useful
energetic
able
capable
skillful
powerful
skilled
dynamic
potent
active

valuable
economical
competent
tough
adequate
decisive
accomplished
adapted
apt
businesslike
clever
conducive

deft
economic
effectual
efficacious
experienced
expert
fitted
handy
masterly
organized
practiced
proficient

qualified
ready
saving
shrewd
systematic
talented
virtuous
equal to
familiar with
good at
good for
well-organized

Antonyms for efficient

impotent
useless
worthless
idle
inactive
lazy
sluggish

ineffective
unable
incapable
incompetent
unskilled
unskillful
fragile

inadequate
helpless
inefficient
powerless
inept
delicate
weak