"important disadvantage" is a correct and usable phrase in written English.
Example sentence: One important disadvantage of living in a big city is the high cost of rent.
This is an important disadvantage of the agglomerate model.
Important disadvantage of this material is the difficulty in predicting the time of fatigue destruction.
Another important disadvantage is the make-up of our natural resources.
An important disadvantage of those simulations is the fundamental burden of computation time.
Another important disadvantage is the lifespan of the fuel cell because of their durability, reliability and maintainability.
The latter represents an important disadvantage for any entity willing to employ resources on managing a LEZ.
Introduction: Injection pain caused by propofol is an important disadvantage, especially in children, incompletely reduced by adding lidocaine intravenously.
An important disadvantage of the WBM is the limited geometrical flexibility as compared to the element based techniques.
A marked decrease in the saturation magnetization by the formation of functional shells around the magnetic core is an important disadvantage of magnetic core-shell nanoparticles.
An equally important disadvantage in continuous revision has to do with the inherent difficulty of revising, on an article-by-article basis, a set of reference books containing many thousands of articles.
However, the Tilt Comp presents an important disadvantage.
