The Collaborative International Dictionary of English v.0.48:

Slight \Slight\, a. [Compar. Slighter; superl. Slightest.]
   [OE. sli?t, sleght, probably from OD. slicht, slecht, simple,
   plain, D. slecht; akin to OFries. sliucht, G. schlecht,
   schlicht, OHG. sleht smooth, simple, Icel. sl?ttr smooth, Sw.
   sl[aum]t, Goth. sla['i]hts; or uncertain origin.]
   1. Not decidedly marked; not forcible; inconsiderable;
      unimportant; insignificant; not severe; weak; gentle; --
      applied in a great variety of circumstances; as, a slight
      (i. e., feeble) effort; a slight (i. e., perishable)
      structure; a slight (i. e., not deep) impression; a slight
      (i. e., not convincing) argument; a slight (i. e., not
      thorough) examination; slight (i. e., not severe) pain,
      and the like. "At one slight bound." --Milton.
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            Slight is the subject, but not so the praise.
                                                  --Pope.
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            Some firmly embrace doctrines upon slight grounds.
                                                  --Locke.
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   2. Not stout or heavy; slender.
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            His own figure, which was formerly so slight. --Sir
                                                  W. Scott.
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   3. Foolish; silly; weak in intellect. --Hudibras.
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The Collaborative International Dictionary of English v.0.48:

Slighter \Slight"er\, n.
   One who slights.
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