slow-witted, doltish, ignorant, benighted ☊ 
ngớ ngẩn ngu ngốc khờ dại 
silly like: ngú ngớ → →
dumm ☊ 
ngu ngốc ☊ 
笨的 ☊ bèn de dumm ☊ ngu ngốc ☊ 笨的 ☊ bèn de dumm ☊ ngu ngốc ☊ 傻的 ☊ shǎ de dumm ☊ ngu ngốc ☊ ☊ das Fabelwesen ☊ tình tiết ngụ ngôn ☊ ☊ Er kämpfte damals in einer gewaltigen Schlacht gegen seine Rivalen, unheimliche Fabelwesen. ☊ Ngày xưa ông đã chiến đấu chống lại địch thủ trong một trận đánh kịch liệt qua những tình tiết ngụ ngôn huyền bí. ☊ (Lektion 71, Nr. 1018) It was a stupid thing to do, I admit. ☊ admit ☊
angry with/at sb about/for sth: I was very angry with myself for making such a stupid mistake. ☊ angry ☊
You'll feel all the better for a good night's sleep. ☊ better ☊
'Goodnight. Sweet dreams.' ☊ dream ☊
You'll feel better after a good night's sleep. ☊ feel ☊
God, what a stupid thing to do! ☊ God, God almighty, God in heaven, good God, my God, oh (dear) God ☊
You insult my intelligence! (= you are treating me as if I am stupid) ☊ insult ☊
That made me feel kind of stupid. ☊ kind of ☊
kiss sb: Go and kiss your mother goodnight. ☊ kiss ☊
I'm not stupid, you know. ☊ you know ☊
He was not stupid, just lazy. ☊ lazy ☊
You'll feel better after you've had a good night's sleep. ☊ night ☊
She's no fool (= she's intelligent). ☊ no ☊
to sleep well/deeply/soundly/badly ☊ sleep ☊
Did you have a good sleep? ☊ sleep ☊
I'll feel better after a good night's sleep (= a night when I sleep well). ☊ sleep ☊
OK, I admit it was not the smartest thing I ever did (= it was a stupid thing to do). ☊ smart ☊
so ... as to do sth: I'm not so stupid as to believe that. ☊ so ☊
a stupid mistake ☊ stupid ☊
It was a pretty stupid thing to do. ☊ stupid ☊
I was stupid enough to believe him. ☊ stupid ☊
It was stupid of you to get involved. ☊ stupid ☊
He'll manage—he isn't stupid. ☊ stupid ☊
Forgetting my notes made me look stupid. ☊ stupid ☊
She always makes me feel really stupid. ☊ stupid ☊
think (that)...: I can't think (that) he would be so stupid. ☊ think ☊
You stupid idiot! ☊ you ☊