IPA: /nɒnˌɪnˈtɒksɪkənt/
KK: /nɑnɪnˈtɑksɪkənt/
A substance that does not cause intoxication or alter mental state.
Water is a common nonintoxicant that keeps you hydrated without any effects on your mind.
Nonintoxicant → It is formed from "non-" (meaning not) and "intoxicant" (from Latin "intoxicare", meaning to poison or make drunk). The word refers to a substance that does not have the effect of intoxication or poisoning.
Think of 'non-' meaning not, and 'intoxicant' referring to something that makes you drunk. So, a nonintoxicant is something that does not make you drunk.