Half-baked

Half-baked: diz-se de algo que não foi bem planejado, de algo que não foi bem pensado, de algo que foi planejado às pressas e sem cuidado

“The trouble with Mick is that some of his ideas are good, but a lot of them are half-baked and can't be used.”

“Editing a student newspaper is difficult because I get a lot of half-baked poems and stories from the kids, and they get upset if I don't publish them.”(www.englishclub.com)