Sentence:  "I want you to eat more balanced meals and exercise more often. I don't think you need to lose weight, at least not by going on some <WSD>kooky</WSD> crash diet." / She brushed off his reply and started walking. "It's not <WSD>kooky</WSD>. ... I'm not going on a <WSD>kooky</WSD> diet. I plan to eat sensibly, just smaller portions, and cut out comfort food entirely." 
Meaning of the word marked with <WSD> tags:  Eccentric, strange, or foolish; crazy or insane; kookish.