adjective. ['ˈvɪʒəˌnɛri'] not practical or realizable; speculative.
noun. ['ˈvɪʒəˌnɛri'] a person with unusual powers of foresight.
noun. ['ˈvɪʒəˌnɛri'] a person given to fanciful speculations and enthusiasms with little regard for what is actually possible.