Lean
Part of speech: adjective
Definition: slim; not fleshy. having little fat. Having little extra or little to spare. Of a fuel-air mixture, having more air than is necessary to burn all of the fuel; more air- or oxygen- rich than necessary for a stoichiometric reaction.
Part of speech: verb
Definition: To hang outwards. To press against.
Example sentence: You must learn from your past mistakes, but not lean on your past successes.
Unprofitable
Part of speech: adjective
Definition: Not making a profit.