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Free of dirt, filth, or impurities (extraneous matter); not dirty, filthy, or soiled.
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Free of contamination, (unwanted) germs, infection, or disease.
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Free of imperfections, blemishes, or defects.
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Free of immorality or criminality.
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Free of infiltration by covert listening or recording devices (bugs), enemy spies, etc.
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Empty.
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Smooth, exact, and performed well.
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That does not damage the environment (as much as some alternative).
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(aerodynamics) Allowing an uninterrupted flow over surfaces, without protrusions such as racks or landing gear.
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(aviation) Having the undercarriage and flaps in the up position.
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Well-proportioned; shapely.
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(informal) Cool or neat.
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Free from restraint; complete; entire; total; utter; pure.