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A dullard is a stupid person — not just bad at one skill, but slow in the mind, with little spark or imagination. It is an old, insult. It sounds like a word from an old novel, not like what young people say in the playground today (they are more likely to say idiot, or something kinder). Because it is old, it can feel heavy and a bit comic when someone uses it now. It is still rude. The picture behind it is dull as in not sharp, not bright.
笨蛋、呆瓜、沒想像力的人（偏書面、老式罵人話）
組成dull + -ard. Dull here means “not bright / not clever”. The ending -ard makes a person of that kind, and it is not a kind ending.
原始詞典資料2 筆記錄
以下是外部詞典記錄的用法，原文照列，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
Dullardname
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A surname.
dullardnoun/ˈdʌlɚd/
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A stupid person; a fool.
- Oh! Richard of Bury, I sighed, for a sharp stone from your sling to pierce with indignant sarcasm the mental armour of these college dullards.
- Whereas some prodigies develop at an early age, Einstein did not exhibit any great genius as a young child. Some people thought he was a dullard.
資料來源：英文維基詞典 English Wiktionary（CC BY-SA 4.0）。 原文照列，未經改寫。