blockhead
🇺🇸
/ˈblɑːkhed/
🇬🇧
/ˈblɒkhed/
someone who is not very smart or does not understand things easily
Don't be such a blockhead, the answer is right in front of you.
그렇게 멍청하진 마, 답이 바로 너 앞에 있어.