na-adjective, noun
slow-moving person; dull person
Derogatory slang for someone who is slow to act, think, or react. Often used in casual, critical contexts.
あいつは本当にスローモーで、仕事がなかなか進まない。
That guy is really slow, and work just doesn't progress.
そんなスローモーなやり方じゃ、間に合わないよ。
With such a slow approach, you won't make it in time.