1) Cheap 2) Miserly 3) Penny-pinching 4) Penurious 5) Stingy 6) Ungenerous 1) Cheeseparing 2) Frugal 3) Mean 4) Miserly 5) Stingy 6) Thrifty 
• (a.) Exhibiting parsimony; sparing in expenditure of money; frugal to excess; penurious; niggardly; stingy.
Stingy. Although in normal language, this has a negative connotation, when applied to a model or an explanation in economics it tends to be positive, meaning that it relies on as simple a structure as possible.
Par`si·mo'ni·ous adjective [ Confer French parcimonieux . See Parsimony .] Exhibiting parsimony; sparing in expenditure of money; frugal to excess; penurious; niggardly; stingy. -- Par`si*mo'ni*ous*ly , adverb -- Par`si*mo'ni*ous*ness , 
too economical miserly 
[adj] - excessively unwilling to spend
penurious adjective excessively unwilling to spend; `parsimonious thrift relieved by few generous impulses`; `lived in a most penurious manner--denying himself every indulgence`
excessively unwilling to spend[SAT terms] excessively unwilling to spend excessively unwilling to spend[Intelligent words] excessively unwilling to spend