1. causing great pain   tortuous   torturous   2. full of twists and turns; complicated   tortuous   torturous   3. an organized group of people (soldiers) moving along together   troupe   troop   4. thing required as a precondition   prerequisite   perquisite   5. swollen; pompous   turgid   turbid   6. to continue; to go forward   precede   proceed   7. a general rule, belief or truth   principal   principle