1. Workers in nuclear research must avoid the deleterious effects of radioactive substances.
2. A statesman should be deliberate in his speech.
3. The writer is well versed in delineating social customs.
4. Parents minding their own business without giving time to their children are delinquent.
5. The boy was delirious from the fever.
6. Don't delude yourself into believing that he will relent.
7. The lowlands were completely deluged.
8. The scholar has delved into the subject for a long time.
9. We don't need demagogues; we already have had too many.
10. His sober demeanor quieted the noisy revelers.