Antonym: harmless. Similar words: charm, harmony, harmonize, harmonious, farm, arm, warm, farmer. Meaning: ['hɑrmfʊl /hɑːm-] 
adj. 1. injurious to physical or mental health 2. able or likely to do harm 3. causing or capable of causing harm 4. constituting a disadvantage 5. contrary to your interests or welfare 6. tending to cause great harm.
adj. 1. injurious to physical or mental health 2. able or likely to do harm 3. causing or capable of causing harm 4. constituting a disadvantage 5. contrary to your interests or welfare 6. tending to cause great harm. 
Random good picture Not show
(31) Drinking is known to be harmful.
(32) These pesticides are environmentally harmful.
(33) It believed the affair was potentially harmful to British aviation.
(34) Continuous exposure to sound above 80 decibels could be harmful.
(35) Polyunsaturated oils are essential for health. Excess is harmful, however.
(36) You'll need sunglasses that will cut out harmful UV rays from the sun.
(37) Some people refuse to buy goods that are overpackaged, because they feel that it is harmful to the environment.
(38) Food must be heated to a high temperature to kill harmful bacteria.
(39) Women are more at risk from the harmful effects of alcohol than men.
(40) Our use of harmful chemicals and the consequent damage to the environment is a very serious matter.
(41) The ozone layer forms a shield against harmful solar rays.
(42) The ozone layer filters harmful UV rays from the sun.
(43) The doctor told her that it was harmful to lace her waist.
(44) Prolonged use of the drug is known to have harmful side-effects.
(45) The researchers say they can find no indication that television has harmful physical effects on children.
(46) It is harmful to the stomach to eat cold food rinsed with beer.
(47) They've set up a research project to investigate the harmful effects of air pollution.
(48) Alcohol is usually not harmful if it is taken in moderation .
(49) They believe that modern farming techniques encourage an excessive reliance on harmful chemicals.
(50) This group of chemicals is known to be harmful to people with asthma.
(51) Such laws could protect the consumer from harmful or dangerous remedies.
(52) The label identifies the products that are least harmful to the environment.
(53) Tears help to protect the eye from potentially harmful foreign bodies.
(54) We ought to reason why it is harmful to health to eat too much.
(55) Worse than all,(www.Sentencedict.com) rubbishy commercials and harmful programmes lead to bad tastes and a distorted viewpoint towards human life.
(56) They're organizing a campaign to draw people's attention to the environmentally harmful effects of using their cars.
(57) They compared the fat intake of groups of vegetarians and meat eaters, and matched their diets up with levels of harmful blood fats.
(58) Cars, trucks and buses produce exhaust nearly as harmful as the factories.
(59) Computers and photocopiers are more harmful than tobacco?
(60) If one is inherently harmful, so is the other.