All efficient antonyms
ef·fi·cient
E e adjective efficient
- wasteful — given to or characterized by useless consumption or expenditure: wasteful methods; a wasteful way of life.
adj efficient
- impotent — not potent; lacking power or ability.
- useless — of no use; not serving the purpose or any purpose; unavailing or futile: It is useless to reason with him.
- worthless — without worth; of no use, importance, or value; good-for-nothing: a worthless person; a worthless contract.
- idle — not working or active; unemployed; doing nothing: idle workers.
- inactive — not active: an inactive volcano.
- lazy — averse or disinclined to work, activity, or exertion; indolent.
- sluggish — indisposed to action or exertion; lacking in energy; lazy; indolent: a sluggish disposition.
- ineffective — not effective; not producing results; ineffectual: ineffective efforts; ineffective remedies.
- unable — lacking the necessary power, competence, etc., to accomplish some specified act: He was unable to swim.
- incapable — not capable.
- incompetent — not competent; lacking qualification or ability; incapable: an incompetent candidate.
- unskilled — of or relating to workers who lack technical training or skill.
- unskillful — not skillful; clumsy or bungling.
- fragile — brittle
- inadequate — not adequate or sufficient; inept or unsuitable.
- helpless — unable to help oneself; weak or dependent: a helpless invalid.
- inefficient — not efficient; unable to effect or achieve the desired result with reasonable economy of means.
- powerless — unable to produce an effect: a disease against which modern medicine is virtually powerless.
- inept — without skill or aptitude for a particular task or assignment; maladroit: He is inept at mechanical tasks. She is inept at dealing with people.
- delicate — Something that is delicate is small and beautifully shaped.
- weak — not strong; liable to yield, break, or collapse under pressure or strain; fragile; frail: a weak fortress; a weak spot in armor.