Synonym: addle-head, addlehead, birdbrain, diver. Similar words: saloon, balloon, doubloon, balloonist, pantaloon, trial balloon, goon, go on. Meaning: [luːn] 
n. 1. a worthless lazy fellow 2. large somewhat primitive fish-eating diving bird of the northern hemisphere having webbed feet placed far back; related to the grebes 3. a person with confused ideas; incapable of serious thought.
n. 1. a worthless lazy fellow 2. large somewhat primitive fish-eating diving bird of the northern hemisphere having webbed feet placed far back; related to the grebes 3. a person with confused ideas; incapable of serious thought. 
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1. That guy's a real loon.
2. Rosie, the woman is crazy as a loon.
3. If only she weren't such a lovesick loon.
4. They were all into loon pants or being heavy duty skinheads.
5. Loon Fung Restaurant A deservedly popular restaurant with all who enjoy genuine Cantonese fare.
6. Would you laugh like a loon at such stupid things?
7. The princess in the tower, the loon in the attic!
8. John van Loon had been sent home from work for wearing a kaftan and he laughed about it.
9. Van Loon did not shy away from controversial statements.
10. Who is that loon over there?
11. To van Loon, human achievement mattered above all things.
12. Fu taught in primary schools, loon majestic, but the speech will be a nervous stutter.
13. An avowed skeptic, van Loon left the Immaculate Conception and the Resurrection out of his subsequent The Story of the Bible, 1923.
14. In the fall the loon (Colymbus glacialis) came, as usual, to moult and bathe in the pond[sentencedict.com], making the woods ring with his wild laughter before I had risen.
15. Van Loon had joined the Unitarian Laymen's League in 1924.
16. Why are loon hatchlings in Wisconsin emerging deformed from their eggs?
17. Van Loon participated in Franklin Delano Roosevelt's 1940 presidential campaign.
18. The less the lame loon learn on its little lame leg, the less the loon limped.
19. A more serious charge against van Loon was the sloppiness of his scholarship.
20. Why add them, with their evocation of the doddering loon, slumped, with listless ear-trumpet, over the board table?
20. Sentencedict.com try its best to collect and create good sentences.
21. All the eye can see are evergreens, a placid body of water and the occasional loon.
22. In the face of the stormy petrel, I am just a groaning seagull, a whimpering loon or a stupid penguin.
23. The next morning Costler was as crazy as a loon — the mountain fever had attacked him.
24. The following story is based upon the Bible. It was rewritten by Hendrik Willem Van Loon.
25. The head of Power's department, Anne Carroll Moore, came to share her admiration of van Loon.