形容詞 dotty:

1. informal or slang terms for mentally irregular
   同義詞：balmy, barmy, bats, batty, bonkers, buggy, cracked, crackers, daft, fruity, haywire, kooky, kookie, loco, loony, loopy, nuts, nutty, round the bend, around the bend, wacky, whacky
2. marked by foolish or unreasoning fondness
   同義詞：crazy, gaga, enamored, infatuated, in love, smitten, soft on, taken with

1. That's my dotty points.
   那是我的弱點(diǎn)。
2. Not another of your dotty ideas for making money!
   你不要再出那些賺錢的餿主意了！
3. She's dotty about this latest boyfriend.
   她非常喜歡這個新交的男朋友。
4. She was getting a bit dotty and could never be left alone.
   她越來越見傻，決不可無人照看。

dot.ty

adj.（形容詞）
dot.ti.er,dot.ti.est

Mentally unbalanced; crazy.
瘋狂的；神經(jīng)不正常的
Amusingly eccentric or unconventional.
古怪的或不合常規(guī)的
Ridiculous or absurd:
可笑的或荒唐的：
例句：
a dotty scheme.
荒唐的計(jì)劃

Having a feeble or unsteady gait; shaky.
不穩(wěn)的，虛弱的；搖晃的
Obsessively infatuated or enamored.
非常熱情或著迷的

來源：
Probably alteration of Scots dottle [silly]
可能為 蘇格蘭語 dottle的變化 [傻的]
from Middle English doten [to dote]
源自 中古英語 doten [昏聵]

【引伸】
dot.tily
adv.（副詞）
dot.tiness
n.（名詞）