"considerable deterioration" is a correct and usable phrase in written English.
It means a significant decline or worsening of something. Example sentence: The recent heavy rains have caused considerable deterioration of the roads, making them difficult to drive on.
However, considerable deterioration in measurable SMN levels occurred, even under optimal storage conditions.
Politics Live readers will remember that Labor released an economic statement just before the election campaign which showed a considerable deterioration in the budget position since May.
Elsewhere in Europe, credit rating agency Moody's downgraded Spain because of concerns over its weak growth prospects and considerable deterioration in the government's financial strength.
It also highlighted the "considerable deterioration of the Spanish government's financial strength" and the "worsening debt affordability" for Madrid as interest payments as a share of revenue rise.
Rapid and short-term heating of zeolite catalysts under MW irradiation allow the reaction to be repeated at higher temperatures without considerable deterioration of catalytic performance.
In addition, by replacing the binder phase Co with Ni or carbide binder, and even without binder phase, the corrosion and oxidation of the resultant materials can be significantly improved without considerable deterioration of fracture toughness.
Post-mortem examinations revealed considerable tissue deterioration and severe internal hemorrhaging.
The surviving print has considerable nitrate deterioration and very poor picture quality in certain parts.
Transplant was associated with continuing poor HRQoL for Physical functioning, and a considerable further deterioration in Social functioning, Career concerns and perceived Body image.
Thus, the observations suggested the considerable surface deterioration of feather by the virtue of keratinase and protease production from bacterial action.
Natural history studies conducted prior to the introduction of disease-modifying drugs (DMDs) to the market (initially interferon [IFN] beta-1b in 1993; IFN beta-1a intramuscular [IM] and glatiramer acetate in 1996) [ 4] found considerable functional deterioration in the years following disease onset [ 5].
