The phrase "are incompletely effective" is correct and usable in written English.
It can be used to describe something that does not fully achieve its intended purpose or effect.
Example: "The new policies are incompletely effective in addressing the root causes of the issue."
Alternatives: "are partially effective" or "are not fully effective."
It is possible that GRK2 is the only kinase involved in initiating P2Y2-receptor desensitization and that the observed partial effects arise because the experimental ablations of GRK2 activity are incompletely effective.
These drugs are incompletely effective and cause significant morbidity.
With a highly transmissible strain (such as the 1918 pandemic strain), in a population with little preexisting immunity, and using vaccines that are incompletely effective, modeling indicates that the proportion of the population that must be immunized for effective immunity is likely to be greater than 80% (11).
Approved disease-modifying therapies may be incompletely effective in some patients with highly active relapsing disease and high risk of disability.
19 Combination amlodipine/valsartan was very effective in lowering BP in patients in whom monotherapy with various other antihypertensives was incompletely effective.
3– 6 Lorazepam (LZP) is the first-line treatment for prolonged seizures and SE, but it is incompletely effective, and its use is limited by respiratory depression.
This partial blockade may arise, because the experimental strategy is incompletely effective, or may indicate that other, so far undefined mechanisms are involved in regulating ETAR responsiveness.
Transcranial magnetic stimulation (TMS) is a promising technique to probe cerebellar function [1], but the parameters that underlie effective cerebellar stimulation are incompletely understood.
Genealogies of individual genes may contribute to misleading species tree topologies if polymorphisms in ancestral populations of high effective population sizes are incompletely sorted during speciation events in close succession [ 32].
However, the effects of FOS on thrombosis are incompletely understood.
Bariatric surgery is the most effective treatment for obesity and type 2 diabetes, but the mechanisms responsible are incompletely understood.
