odorless
Lacking any scent
Odorless means having no smell.
Carbon monoxide is dangerous partly because it's odorless—you can't detect it without instruments.
The word often appears in safety contexts or product descriptions: odorless paint, odorless cleaning solution.
Something truly odorless is rare; the term usually means no *noticeable* or *unpleasant* smell.
Without added smell
- scentlessWithout any aroma
- unscentedHaving no added smell
- unperfumedHaving no added fragrance
- smell-freeEmitting no odor
hypoallergenic · nonallergenic · neutral · plain · undetectable · imperceptible · faint · subtle
Inactive, physically or chemically
- colorlessDevoid of pigmentation
- tastelessHaving no flavor
- volatileLiable to sudden change
- gaseousIn vapor form
vaporous · nontoxic · stable · unreactive · pure · clear · transparent · nitrogen
Lightest noble gas
- neonInert illuminating element
- argonUnreactive element eighteen
- kryptonInert gas, atomic thirty-six
- xenonElement fifty-four, noble gas
radon · inert · monatomic · stable · unreactive · colorless · nonflammable
Radioactive inert gas
- undetectableImpossible to notice
- lethalCausing or capable of death
- toxicCapable of causing harm
- poisonousCapable of causing death
hazardous · warning · detector · alarm · ventilation · exposure · leak
Microbe-killing substance
- sanitizedCleansed of contaminants
- hygienicClean and disease-preventing
- asepticFree from pathogens
- clinicalEmotionally detached, medically precise
medical-grade · sterilized · disinfected · purified · uncontaminated · hospital · surgical · laboratory
fragrance-free
Without added smell
- scentlessWithout any aroma
- unscentedHaving no added smell
- unperfumedHaving no added fragrance
smell-free · hypoallergenic · nonallergenic · neutral · plain · undetectable · imperceptible · faint · subtle · mild
inert
Inactive, physically or chemically
gaseous · vaporous · nontoxic · stable · unreactive · pure · clear · transparent · nitrogen · hydrogen
helium
Lightest noble gas
xenon · radon · inert · monatomic · stable · unreactive · colorless · nonflammable
radon
Radioactive inert gas
- undetectableImpossible to notice
- lethalCausing or capable of death
- toxicCapable of causing harm
poisonous · hazardous · warning · detector · alarm · ventilation · exposure · leak
antiseptic
Microbe-killing substance
clinical · medical-grade · sterilized · disinfected · purified · uncontaminated · hospital · surgical · laboratory · pharmaceutical
- cleanlinessclean, cleanliness, clean up, dirty, neatness
- smellsmell, scent, reek, aroma, sniff
- product qualitiesdurable, lightweight, flexible, sturdy, portable
- scent wordsfragrant, aromatic, pungent, musty, musky
- water qualitiesmurky, taste, color, fresh, salty
- negative adjectivesawful, bad, cruel, dumb, evil
odorlessodorous
Emitting a scent
scented · smelly · aromatic · odoriferous · fragrant
odorlesspungent
Sharply strong-smelling
overpowering · heady · acrid · sharp · penetrating
odor, deodorant, odorous, deodorize, malodorous, deodorized, olfactory, deodorizer, deodorizing