All improve antonyms

verb improve

• waste — to consume, spend, or employ uselessly or without adequate return; use to no avail or profit; squander: to waste money; to waste words.
• prove — to establish the truth or genuineness of, as by evidence or argument: to prove one's claim.
• disimprove — (transitive, rare) to make worse.
• recede — to go or move away; retreat; go to or toward a more distant point; withdraw.
• retreat — the forced or strategic withdrawal of an army or an armed force before an enemy, or the withdrawing of a naval force from action.
• retrogress — to go backward into an earlier and usually worse condition: to retrogress to infantilism.
• decrease — When something decreases or when you decrease it, it becomes less in quantity, size, or intensity.
• repress — to keep under control, check, or suppress (desires, feelings, actions, tears, etc.).
• lessen — to become less.
• hinder — to cause delay, interruption, or difficulty in; hamper; impede: The storm hindered our progress.
• worsen — Make or become worse.
• deteriorate — If something deteriorates, it becomes worse in some way.
• demote — If someone demotes you, they give you a lower rank or a less important position than you already have, often as a punishment.
• ruin — ruins, the remains of a building, city, etc., that has been destroyed or that is in disrepair or a state of decay: We visited the ruins of ancient Greece.
• damage — To damage an object means to break it, spoil it physically, or stop it from working properly.
• corrupt — Someone who is corrupt behaves in a way that is morally wrong, especially by doing dishonest or illegal things in return for money or power.
• dirty — soiled with dirt; foul; unclean: dirty laundry.
• pollute — to make foul or unclean, especially with harmful chemical or waste products; dirty: to pollute the air with smoke.
• weaken — to make weak or weaker.
• destroy — To destroy something means to cause so much damage to it that it is completely ruined or does not exist any more.
• harm — a U.S. air-to-surface missile designed to detect and destroy radar sites by homing on their emissions.
• injure — to do or cause harm of any kind to; damage; hurt; impair: to injure one's hand.
• halt — to falter, as in speech, reasoning, etc.; be hesitant; stumble.
• stop — to cease from, leave off, or discontinue: to stop running.
• hurt — to cause bodily injury to; injure: He was badly hurt in the accident.
• descend — If you descend or if you descend a staircase, you move downwards from a higher to a lower level.
• lower — to cause to descend; let or put down: to lower a flag.
• decline — If something declines, it becomes less in quantity, importance, or strength.
• drop — a small quantity of liquid that falls or is produced in a more or less spherical mass; a liquid globule.
• lose — to come to be without (something in one's possession or care), through accident, theft, etc., so that there is little or no prospect of recovery: I'm sure I've merely misplaced my hat, not lost it.
• diminish — to make or cause to seem smaller, less, less important, etc.; lessen; reduce.
• depress — If someone or something depresses you, they make you feel sad and disappointed.
• reduce — to bring down to a smaller extent, size, amount, number, etc.: to reduce one's weight by 10 pounds.
• blow — When a wind or breeze blows, the air moves.
• dull — not sharp; blunt: a dull knife.