advanced complex complicated difficult elaborate challenging fancy hard intricate involved sophisticated tricky deep demanding detailed elite tough head chief first leading principal main premier prime supreme foremost front highest top topmost commanding high lead preeminent presiding primary supereminent arch ranking champion pioneer stellar superior dominant senior notable noteworthy prominent major controlling ruling elevated upper grand lofty eminent influential distinguished powerful authoritative prestigious higher predominant superordinate loftier paramount key consequential illustrious guiding cardinal focal central exalted important directing essential celebrated renowned famous momentous skookum