1) Abating 2) Allargando 3) Calando 4) Declining 5) Decrescendo 6) Decrescent 7) Depreciating 8) Depreciative 9) Depreciatory 10) Despair 11) Detractive 12) Diminishing 13) Dwindling 14) Rallentando 15) Ritardando 16) Ritenuto 17) Subsiding 18) Waney 1) Abating 2) Becoming less or fewer 3) Becoming less or smaller 4) Depreciating 5) Depreciative 6) Depreciatory 7) Detractive 8) Diminishing 9) Dwindling 10) Falling 11) Music 12) Subsiding 13) Tapering 14) Tapering off 
• (a.) Becoming less and less; diminishing. • (p. pr. & vb. n.) of Decrease
De·creas'ing adjective Becoming less and less; diminishing. -- 
[adj] - music 2. [adj] - becoming less or smaller
adjective becoming less or smaller
becoming less or fewer; diminishing. · (of a function) having the property that for any two points in the domain such that one is larger than the other, the image of the larger point is less than or equal to the image of the smaller point; nonincreasing. Cf. increasing (def. 2).