Having a harmful or damaging effect.
The constant shouting was having a deleterious effect on the child's mood. Every angry word felt like a small injury, chipping away at his peace. He just wanted it to stop, to find some quiet before the damage became too much.
The fumes from the old machinery had a deleterious effect on the workers’ lungs. They coughed constantly, their breathing shallow. This harmful damage made every day a struggle, a constant reminder of the poison in the air.
The constant scraping noises from the leaky pipe were having a deleterious effect on Anya's focus. Every drip, drip, drip felt like a tiny hammer hitting her nerves, making it impossible to even think about the complex wiring diagrams spread before her. It was a slow, maddening torture.
My cat, Bartholomew, has a truly deleterious habit of unrolling all the toilet paper. The bathroom looks like a mummy convention, and it's quite damaging to my sense of order, frankly. He thinks it's a game, but it's just making a big mess.
Eating that entire tub of neon-pink pickles had a surprisingly deleterious effect on Bartholomew's pet rock's aura. Instead of a soothing glow, it started emitting tiny, angry squeaks, which was rather deleterious to his afternoon nap plans.
The constant criticism had a deleterious effect on her confidence. Each harsh word chipped away at her self-worth, leaving her feeling hollow and broken. She knew this negativity was damaging, making her doubt everything she did.
The constant, grating buzz from the faulty transformer was having a deleterious effect on the entire neighborhood. Sleep became impossible, tempers flared over trivial matters, and even the normally cheerful stray cat seemed to hunch with a persistent headache, its playful meows replaced by anxious yowls.
The constant hum of the ancient data core was starting to have a deleterious effect on Elara's focus. Sleep deprivation gnawed at her, each blinking cursor a tiny spark of irritation. She knew prolonged exposure was damaging, making her clumsy and forgetful, but the urgent retrieval mission left no room for rest.
My cat's habit of batting my expensive sunglasses off the counter has a decidedly deleterious effect on my bank account. The tiny paw swipes leave scratches that are just plain harmful. I swear he thinks it's a game, but my wallet disagrees.
My pet rock, Bartholomew, developed a truly deleterious obsession with collecting lint. It started with a single fuzzy wisp, but now his tiny crevices are choked with it. I fear his calcium carbonate structure is suffering, a truly damaging effect from his fluffy fixation.
The constant worry about their job security began to have a truly deleterious effect on their health. Sleep became difficult, and their once good appetite vanished, leaving them feeling hollow and drained by the persistent stress.
The prolonged exposure to unchecked electromagnetic pulses from the malfunctioning chronometer began to have a deleterious effect on the bio-luminescent moss. Its vibrant glow flickered erratically, a clear sign of the damage being done to its cellular structure, a grim precursor to wilting and death.
The constant, high-pitched whine of the malfunctioning chronometer was having a deleterious effect on the entire crew. Sleep deprivation was rampant, and tempers flared over the slightest provocation. Soon, even simple repairs became impossibly complex, threatening the mission’s very survival.
My landlord, a man whose eyebrows appeared to have waged a silent, yet vigorous, war with his comb, insisted that his "experimental composting technique" would be a boon to the neighborhood. Unfortunately, the resulting odor, a noxious symphony of fermented socks and regret, proved quite deleterious, causing even the most stoic pigeons to evacuate the vicinity.
My uncle Bartholomew's unwavering commitment to competitive interpretive dance had a deleterious effect on his prize-winning collection of artisanal cheeses. The vigorous pirouettes often sent wheels of gouda and wedges of brie ricocheting into the chandelier, rendering them inedible for future tastings.
The relentless, unrelenting noise from the construction site had a deleterious effect on the neighborhood, fraying nerves and disrupting sleep. Residents found their once tranquil existence assailed by a constant, harmful barrage, diminishing their quality of life with each passing day.
The prolonged exposure to ambient sonic frequencies generated by the subterranean geothermal vents proved deleterious. Workers experienced escalating disquietude, their cognition noticeably impaired. The pervasive hum, initially an annoyance, fostered a deep, unsettling lassitude that eroded morale and jeopardized project timelines with alarming swiftness.
The prolonged exposure to the saccharine fumes from the rogue confectionery fabrication unit had a deleterious effect on the miners' respiratory systems, causing persistent coughs and a gnawing unease about their dwindling air supply. Their once robust lungs felt irrevocably compromised.
Unfettered consumption of those purportedly miraculous "miracle berries" proved quite deleterious to Bartholomew's digestive tract. His robust countenance rapidly devolved into a jaundiced pallor, and his erstwhile robust pronouncements were reduced to plaintive whimpers echoing his profound gastrointestinal opprobrium.
The clandestine assembly of sentient cheese graters, fueled by fermented cabbage wine, commenced their nefarious nocturne. Their incessant, grating discourse proved deleterious to the fragile olfactory equilibrium of nearby gargoyles, who began to weep a viscous, mozzarella-like tear.
Advanced — Less frequent words that stretch an upper-level vocabulary.