1) Abiding 2) Ageless 3) Around the clock 4) Ceaseless 5) Constant 6) Continued 7) Continuous 8) Deathless 9) Enduring 10) Eternal 11) Everlasting 12) Imperishable 13) Interminable 14) Lasting 15) Permanent 16) Perpetual 17) Sustained 18) Unending 19) Unfailing 20) Unflagging 21) Unremitting 1) Ageless 2) Endless 3) Eternal 4) Everlasting 5) Lasting 6) Not ceasing or stopping 7) Permanent 8) Perpetual 9) Unending 
not ceasing or stopping; continuous: an unceasing flow of criticism.