| sill | (noun) structural member consisting of a continuous horizontal timber forming the lowest member of a framework or supporting structure | - |
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| (noun) (geology) a flat (usually horizontal) mass of igneous rock between two layers of older sedimentary rock | - |
| sillabub | (noun) sweetened cream beaten with wine or liquor | Synonyms: syllabub |
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| (noun) spiced hot milk with rum or wine | Synonyms: syllabub |
| silliness | (noun) a ludicrous folly | Synonyms: absurdity, fatuity, fatuousness |
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| (noun) an impulsive scatterbrained manner | Synonyms: giddiness |
| silly | (adjective) dazed from or as if from repeated blows | Synonyms: punch-drunk, slaphappy |
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| (adjective) ludicrous, foolish | Synonyms: goofy, wacky, whacky, zany |
| (adjective) lacking seriousness; given to frivolity | Synonyms: airheaded, dizzy, empty-headed, featherbrained, giddy, light-headed, lightheaded |
| (adjective) inspiring scornful pity | Synonyms: pathetic, ridiculous |
| (noun) a word used for misbehaving children | - |