Adjective : a complex highway system. ,complex machinery. ,a complex problem. ,complex methods; complex vector space.    From Dictionary.com. 

Noun : the entire complex of our educational system; an apartment complex. ,receptor-hormone complex, enzyme-substrate complex.    From Dictionary.com. 

Joseph irked a certain complexness of his mentality.    From Wordnik.com.  [The Head of the House of Coombe] Reference

The price per PSD varies from USD 30 to USD 50 only which depends upon the complexness of the layout.    From Wordnik.com.  [Digital Point Forums] Reference

For instance, the Saint-Gaudens Double Eagle omega counterfeit is notorious for its complexness; and has duped many coin collecting experts.    From Wordnik.com.  [ReadABlog.com New Blogs and RSS Feeds] Reference

It is a long way from the plaints of George Horton to the invectives of Claude McKay, from the obviousness of Frances Harper to the complexness of Anne Spencer.    From Wordnik.com.  [The Book of American Negro Poetry] Reference

The diverse management jobs and duties demanded in a project are to the full accounted and are adaptable to accommodate the complexness of the project and accomplishments of the establishment.    From Wordnik.com. Reference