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• a  lacking material form or substance; unreal
  as insubstantial as a dream
  an insubstantial mirage on the horizon
• s  lacking in nutritive value

• Both of the right-wing populists, Tom Tancredo and Duncan Hunter, seem obscure and insubstantial, a classic problem for House members running for President; neither is as .
• The not insubstantial paunch he has added since then is a source of some consternation.
• The not insubstantial paunch he has added since then is a source of some consternation.

• unsubstantial
• unreal
• jejune

• substantial

News & Articles

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• 'The Kings of Summer' is a clumsy coming-of-age story
  The film comes across as an insubstantial lark, no more mature than its protagonists.
  June 26, 2013 - Las Vegas Weekly

Quotes

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• David Cameron in guardian.co.uk
  I think it is slightly cynical in its timing; it is rather insubstantial in its content and it is not part of an overall approach,Cameron said on GMTV.
• David Ford in Belfast Telegraph
  Mr Ford added: "We have an Executive which is dysfunctional, operating to a weak and insubstantial programme for government. It is not very good at implementing that programme and well-nigh incapable of agreeing anything else. Where issues were not...
• Foreign Secretary Margaret Beckett in guardian.co.uk
  Mrs Beckett described the publication as "threadbare, insubstantial and just plain wrong", adding: "Chatham House has established a great reputation over the years, but this paper will do nothing to enhance it."