noxious

/ˈnɒkʃəs/adjective

Poisonous or damaging, especially to health.

Example sentence

“Open a window when using the paint to avoid breathing noxious vapours.”

Standard with 'fumes' and 'gases'. Stronger than 'unpleasant': noxious things do actual harm.

Related words

nuanceA very small difference in meaning, feeling, colour, or sound.noveltySomething new and unusual, often interesting mainly because it has not been seen before.nuisanceSomething or someone that causes small but irritating problems.novelDifferent from anything seen before, in a fresh and interesting way.nullifyTo cancel something officially so that it no longer has legal force.nourishTo give a person, animal, or plant the food or other things needed to live and grow.