We　propose　an　efficient　scheme　to　drive　two　atoms　in　two　coupled　cavities　into　a　two-atom　singlet　state　via　quantum　Zeno　dynamics　and　virtual　excitations　by　one　step.　Then,　we　convert　the　two-atom　singlet　state　into　a　three-atom　singlet　state　in　three　coupled　bimodal　cavities　with　the　same　principle.　We　also　discuss　the　influence　of　decoherence　induced　by　cavity　decay　and　atomic　spontaneous　emission　by　numerical　calculation.　This　scheme　is　robust　against　both　the　cavity　decay　and　atomic　spontaneous　emission　since　there　are　no　excited　cavity　fields　involved　during　the　operation　process,　and　the　atoms　are　only　virtually　excited.　Actually,　if　multi-level　atoms　and　multi-mode　cavities　are　applicable,　we　can　convert　the　(n-1)-atom　(n　＞=　3)　singlet　state　into　a　n-atom　singlet　state　in　coupled　cavity　arrays　with　the　same　principle　in　theory.