General qualities

Quiet/Loud
Low/High
Short/Long
Close/Distant
Non Dynamic/Dynamic
Tonal/Noisy
Natural/Artificial

Timbre

Dull/Bright
Smooth/Rough
Dry/Resonnant
Non Nasal/Nasal
Non Rich/Rich
Non Round/Round
Warm
Strident
Metallic

Morphology

Fast/Slow Attack
Fast/Slow Release
Crescendo/Decrescendo
Ascending/Descending
Constant/Fluctuating
Continuous/Discontinuous

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Close/Distant

The terms close and distant are related to the distance between the sound source and the listener. A close source is perceived as louder without any reverberation effect. A distant source is perceived as less loud and less bright, with more reverberation effect caused by the surrounding space.

Musical instruments Female/Male voices Environmental sounds Simple sounds Complex sounds