Slow.

Stupid, dull. A “quick boy” is one who is sharp and active. Awfully slow, slang for very stupid and dull

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Entry taken from Dictionary of Phrase and Fable, edited by the Rev. E. Cobham Brewer, LL.D. and revised in 1895.

Slippers
Slipshod
Slipslop
Sloane MSS
Slogan
Slop (Dr.)
Slops (The)
Slopard (Dame)
Slope
Slough of Despond
Slow
Slow Coach
Slubber-Degullion
Slug-abed (A)
Slumland
Slums
Sly (Christopher)
Sly-Boots
Sly Dog
Sly as a Fox
Slyme (Chevy)

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