harmless adjective Not able or likely to cause any injury, damage, or negative effect. The spider looked frightening but was completely harmless to humans. + careless adjective Not giving enough attention or thought to what one is doing, resulting in mistakes or harm. A careless mistake in the calculations caused the bridge design to fail inspection. + fearless adjective Showing no fear; brave in the face of danger or difficulty. The fearless firefighter ran back into the burning building to save the dog. + hopeless adjective Without hope; offering no possibility of improvement or success. The rescue mission seemed hopeless until the storm finally cleared. + useless adjective Not able to fulfill its intended purpose, or having no practical use or effect. The broken umbrella was useless in the middle of the storm. + restless adjective Unable to stay still, relax, or sleep because of anxiety, boredom, or excess energy. The children grew restless during the long car ride and started arguing over toys. + tireless adjective Never becoming tired, especially through continuous hard work or effort. The volunteers were tireless in their search for the missing hiker. + endless adjective Having or seeming to have no end; continuing for a very long time. The desert highway stretched out in what felt like an endless straight line. + homeless adjective Without a permanent place to live. The shelter provides warm meals and beds for homeless families in the city. + jobless adjective Without paid work; unemployed, especially describing a person or an economic condition. The factory closure left hundreds of workers jobless just before the holidays. + painless adjective Not causing physical or emotional pain; easy and free of difficulty. The dentist assured her the new procedure would be quick and painless. + priceless adjective So valuable that its worth cannot be measured in money, or, informally, extremely funny or absurd. The museum proudly displayed a priceless collection of ancient Egyptian artifacts. + reckless adjective Acting without thinking about the danger or harmful consequences of one's actions. The reckless driver sped through the red light without slowing down. + ruthless adjective Having no pity or compassion for others, especially in pursuing a goal. The ruthless dictator crushed any opposition to his rule without hesitation. + senseless adjective Lacking meaning, reason, or purpose; done for no sensible or justifiable reason. The senseless act of vandalism destroyed a memorial that meant a lot to the community. + speechless adjective Temporarily unable to speak because of strong emotion such as shock, surprise, or admiration. She was left speechless when her coworkers surprised her with the award. + thoughtless adjective Showing no consideration for the feelings or needs of other people; careless or inconsiderate. It was thoughtless of him to cancel the plans without telling anyone. + timeless adjective Not affected by the passage of time; remaining appealing or relevant regardless of era. The novel's themes about love and loss feel timeless even today. + worthless adjective Having no real value, use, or importance whatsoever. The old coins turned out to be worthless replicas, not genuine antiques. + ageless adjective Never appearing to grow old, or having a timeless appeal that does not fade. Her ageless beauty made it hard to guess she was over sixty. + breathless adjective Unable to breathe easily, usually from exertion, excitement, or strong emotion. She arrived breathless at the gate after sprinting through the terminal. + effortless adjective Done easily, without any noticeable difficulty or strain. The dancer made the complicated routine look effortless. + flawless adjective Completely without any faults, mistakes, or imperfections. The gymnast delivered a flawless routine that earned her a perfect score. + helpless adjective Unable to do anything to protect or help oneself; lacking power, strength, or resources. The kitten looked utterly helpless, shivering alone in the cold evening rain. + lifeless adjective Without life; dead, or lacking energy, vitality, or spirit. Rescuers pulled the lifeless body of the hiker from beneath the snow. + meaningless adjective Having no meaning, purpose, or significance. The instructions were so vague that they seemed completely meaningless to everyone. + needless adjective Not necessary and easily avoided with a little more care or foresight. Turning back for the umbrella caused a needless delay before the trip. + powerless adjective Lacking the ability, strength, or authority to do something or prevent something from happening. Without a majority in parliament, the party was powerless to pass new laws. + shameless adjective Showing no sense of guilt, embarrassment, or regard for what others think, despite doing something wrong or improper. The politician made a shameless attempt to blame others for his own mistakes. + spotless adjective Completely clean, with no stains, dirt, or marks at all. She kept her kitchen spotless, wiping down every counter after cooking. + wireless adjective Operating without a physical wire or cable connection, typically using radio signals. She connected her laptop to the wireless network in the coffee shop. +