From The Collaborative International Dictionary of English v.0.48:
Dirty \Dirt"y\, a. [Compar. Dirtier; superl. Dirtiest.]
1. Defiled with dirt; foul; nasty; filthy; not clean or pure;
serving to defile; as, dirty hands; dirty water; a dirty
white. --Spenser.
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2. Sullied; clouded; -- applied to color. --Locke.
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3. Sordid; base; groveling; as, a dirty fellow.
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The creature's at his dirty work again. --Pope.
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4. Sleety; gusty; stormy; as, dirty weather.
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Storms of wind, clouds of dust, an angry, dirty sea.
--M. Arnold.
Syn: Nasty; filthy; foul. See Nasty.
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From The Collaborative International Dictionary of English v.0.48:
Dirty \Dirt"y\, v. t. [imp. & p. p. Dirtied; p. pr. & vb. n.
Dirtying.]
1. To foul; to make filthy; to soil; as, to dirty the clothes
or hands.
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2. To tarnish; to sully; to scandalize; -- said of
reputation, character, etc.
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From The Collaborative International Dictionary of English v.0.48:
Colorless \Col"or*less\, a.
1. Without color; not distinguished by any hue; transparent;
as, colorless water; a colorless gas.
Note: [Narrower terms: ashen, bloodless, livid, lurid, pale,
pallid, pasty, wan, waxen; neutral; white] [Also
See: achromatic, colorless.]
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2. Free from any manifestation of partial or peculiar
sentiment or feeling; not disclosing likes, dislikes,
prejudice, etc.; as, colorless music; a colorless style;
definitions should be colorless.
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3. having lost its normal color.
Note: [Narrower terms: blanched, etiolate, etiolated,
whitened; bleached, faded, washed-out, washy;
dimmed, dulled, grayed; dirty; dull, sober,
somber, subfusc] colored
Syn: colorless, uncolored, uncoloured.
[WordNet 1.5 +PJC]