un-substantial

synonyms for un-substantial

• fanciful
• implausible
• rare
• unbelievable
• unlikely
• doubtful
• dubious
• far-fetched
• flimsy
• hundred-to-one
• iffy
• inconceivable
• not expected
• outside chance
• questionable
• slim
• slim and none
• uncertain
• unconvincing
• unheard of
• unimaginable
• unsubstantial
• weak

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Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.