the.com/odorless
The smell that isn't there — nature's polite way of saying nothing at all.
means Having no detectable scent, neither pleasant nor foul, registering as a total blank to the nose.
from From Latin odor (smell) plus the Old English suffix -less, meaning without — a smell so absent it needed a word.
Deadly twistCarbon monoxide is odorless, which is why it kills quietly.
Added on purposeNatural gas gets a rotten-egg scent so leaks announce themselves.
Water debatePure water is technically odorless; your tap water isn't pure.