All useful antonyms

adj useful

• 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.
• impotent — not potent; lacking power or ability.
• incapable — not capable.
• unproductive — having the power of producing; generative; creative: a productive effort.
• inappropriate — not appropriate; not proper or suitable: an inappropriate dress for the occasion.
• inconvenient — not easily accessible or at hand: The phone is in an inconvenient place.
• unsuited — appropriate: She is suited to such a job.
• unacceptable — capable or worthy of being accepted.
• bad — If you say that it is bad that something happens, you mean it is unacceptable, unfortunate, or wrong.
• disagreeable — contrary to one's taste or liking; unpleasant; offensive; repugnant.
• misbehaving — to behave badly or improperly: The children misbehaved during our visit.
• unhelpful — giving or rendering aid or assistance; of service: Your comments were very helpful.
• awkward — An awkward situation is embarrassing and difficult to deal with.
• unhandy — not skillful in manual work: He's unhandy when it comes to fixing things around the house.
• improper — not proper; not strictly belonging, applicable, correct, etc.; erroneous: He drew improper conclusions from the scant evidence.
• unfitting — suitable or appropriate; proper or becoming.
• unusable — available or convenient for use: 2000 square feet of usable office space.
• unvaluable — having considerable monetary worth; costing or bringing a high price: a valuable painting; a valuable crop.
• disadvantageous — characterized by or involving disadvantage; unfavorable; detrimental.
• unskilled — of or relating to workers who lack technical training or skill.
• unsuitable — not suitable; inappropriate; unfitting; unbecoming.
• harmful — causing or capable of causing harm; injurious: a harmful idea; a harmful habit.
• hurtful — causing hurt or injury; injurious; harmful.
• injurious — harmful, hurtful, or detrimental, as in effect: injurious eating habits.