a. 1. Having no power to resist; making no opposition. [ Obs. or R. ] Spenser. [ 1913 Webster ]

2. Incapable of being resisted; irresistible. [ 1913 Webster ]

Masters' commands come with a power resistless
To such as owe them absolute subjection. Milton. [ 1913 Webster ]

-- Re*sist"less*ly, adv. -- Re*sist"less*ness, n. [ 1913 Webster ]