Tending to cause hallucinations or characteristic of hallucinations; producing false perceptions.
From hallucinate with the adjectival suffix -ive, meaning 'tending to do' or 'having the quality of.' The -ive suffix often creates adjectives from verbs.
Some hallucinative drugs like LSD don't actually create false perceptions so much as they amplify and distort real ones—your brain starts noticing colors and patterns it normally filters out, which is why the visual experience is so intense.
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