1. thing required as a precondition   perquisite   prerequisite   2. a general rule, belief or truth   principle   principal   3. state of person's or group's confidence and spirits   morale   moral   4. general survey; critical report; revision   revue   review   5. causing great pain   tortuous   torturous   6. full of twists and turns; complicated   tortuous   torturous   7. not outstanding; ordinary   unexceptionable   unexceptional