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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Continuous/Discontinuous

The continuity or discontinuity of a sound is related to the absence or presence of silences over its evolution. If a sound is uninterrupted, it is continuous. One may use the word legato for a musical phrase. If a sound is interrupted by silences, it is discontinuous. One may use the word staccato for a musical phrase.

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