Lack of efficiency; a method or state that wastes time, effort, or resources (can function as a noun or na-adjective).
手作業が多いと業務は非効率になりやすい。
When there is a lot of manual work, operations tend to become inefficient.
その会議の進め方は非効率で、時間の無駄だった。
The way that meeting was run was inefficient and a waste of time.
古いシステムは非効率で、更新が必要だ。
The old system is inefficient and needs to be updated.