creeping

creeping
adj [attrib 作定语]
(of sth bad) gradual （指坏事）逐渐发展的, 日趋严重的
    The disease results in creeping paralysis. 这种病可发展成脊髓痨.
    creeping inflation in the housing market 房产价格的不断上涨.

牛津英汉双解词典