The phrase "are lessened" is correct and usable in written English.
It can be used when discussing a reduction in intensity, severity, or amount of something.
Example: "The effects of the medication are lessened when taken with food."
Alternatives: "are reduced" or "are diminished".
The practical disadvantages to the taxpayer are lessened by the pressures on the Government to check and negate relevant leads.
There is some evidence that cravings are lessened by fasting, although this is a hard topic to study.
In this way, the temporal and spatial resolution of dynamic MR images is improved and the artifacts are lessened.
Minor flood risks are lessened, but dam breaks or levee breaches caused 52 major floods over the last 23 years.
The A.S.P.C.A., along with other animal advocates, believes the hazards are lessened if cargo companies take on the task when animals absolutely must travel by air.
Their chances are lessened by playing in Malabo, with its genteel 15,000-capacity stadium, rather than Bata, which can accommodate almost 40,000.
Wherever regeneration of social housing has been outsourced to private developers, responsiveness, transparency, oversight and scrutiny – key elements of healthy democracy – are lessened for those most directly affected.
These restraints are lessened when addressing public health concerns, and are essentially set aside when exigent circumstances require immediate action to protect the public health.
Our own military budget and the belligerent rhetoric of our political candidates show that preparation for war doesn't slow down even as its possibilities are lessened.
This puts the onus on diplomatic avenues; yet with the blockade lifted, Armenia's incentives to offer concessions to Azerbaijan are lessened.
The changes are aimed at making the story more accessible to international audiences, and as part of this process the links made to the current government are lessened.
