1812, "full of dots," from dot (n.) + -y (2). Meaning "silly" is from c. 1400, in dotypolle "dotty poll" (i.e. "dotty head"), in which case the first element is from dote (v.).
例文
1. She was obviously going a bit dotty .
彼女は明らかに少し気が狂っているようになった。/
2.That 's my dotty points.
それが私の弱点です。
3.I freely confess I 'm as dotty as you are.
私は率直に認めて、私はあなたと同じように気が狂っている。
4.Not another of your dotty ideas forメイキングmoney!
お金を稼ぐようなくだらない考えはやめて!
5.He did not look like a ghost,more like someone 's dotty father.