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We found 15 dictionaries with English definitions that include the word sillier:
Click on the first link on a line below to go directly to a page where "sillier" is defined.

General (12 matching dictionaries)

1. sillier: Merriam-Webster.com [home, info]
2. sillier: Oxford Dictionaries [home, info]
3. sillier: Collins English Dictionary [home, info]
4. sillier: Vocabulary.com [home, info]
5. Sillier, sillier: Wordnik [home, info]
6. sillier: Cambridge Advanced Learner's Dictionary [home, info]
7. sillier: Wiktionary [home, info]
8. sillier: Dictionary.com [home, info]
9. sillier: Cambridge Dictionary of American English [home, info]
10. sillier: Free Dictionary [home, info]
11. sillier: LookWAYup Translating Dictionary/Thesaurus [home, info]
12. sillier: Dictionary/thesaurus [home, info]

Business (1 matching dictionary)

13. sillier: Legal dictionary [home, info]

Computing (1 matching dictionary)

14. sillier: Encyclopedia [home, info]

Miscellaneous (1 matching dictionary)

15. sillier: Idioms [home, info]

(Note: See silliness for more definitions.)

Quick definitions from WordNet (silliness) ▸ noun:  an impulsive scatterbrained manner ▸ noun:  a ludicrous folly ▸ Also see silliness ▸ Words similar to sillier ▸ Usage examples for sillier ▸ Popular adjectives describing sillier ▸ Words that often appear near sillier ▸ Rhymes of sillier ▸ Invented words related to sillier