说某人缺乏逻辑可以说the lack of logic in sb.

说某人缺乏逻辑可以说the lack of logic in sb.
说某人缺乏逻辑可以说the lack of logic in sb.

说某人缺乏逻辑可以说the lack of logic in sb.
his/her/sb's lack of logicality

最简单的 it's not logical
his/her idea is not logical
logical本身就有 符合逻辑 的意思