noun
A mildly critical but often affectionate term for someone who is habitually careless, forgetful, or scatterbrained. The 屋 suffix marks a person with that trait.
彼はそそっかし屋で、よく鍵を忘れる。
He's a scatterbrain and often forgets his keys.
そそっかし屋の私は、待ち合わせ時間を間違えてしまった。
Being a careless person, I got the meeting time wrong.