DECREASE, diminish, lessen; abridge (shorten) [See Shortness]; shrink (contract) [See Contraction]; drop off, fall off, tail off; fall away, waste, wear; wane, ebb, decline; descend [See Descent]; subside; melt away, die away; retire into the shade, hide its diminished head, fall to a low ebb, run low, languish, decay, crumble, erode, consume away.
BATE, abate [archaic], dequantitate [obs.]; discount, belittle, minify [rare], minimize, minish [rare], depreciate; extenuate, lower, weaken, attenuate, fritter away; mitigate (moderate) [See Moderation]; dwarf, throw into the shade; reduce [See Contraction]; shorten [See Shortness]; subtract [See Nonaddition. Deduction]; deliquesce, ease, remit [rare].
ADJECTIVE:
UNINCREASED &c. (see increase [See Increase]); decreased, decreasing &c. v.; decrescent, reductive; deliquescent, contractive; decrescendo; on the wane &c. n.