The phrase "deeply harmful" is correct and usable in written English.
You can use it to describe something that has very negative consequences. For example: "The long-term effects of climate change are deeply harmful to the environment."
There's a lot of evidence that this has been deeply harmful to Ashton Whitaker himself – that there's been psychological harm, there's been suicidal ideation, there's the scholastic harm of wasting time from running to and from this one bathroom he can use instead of sitting in class".
For many dealing with a true psychopath can be a deeply harmful experience.
"Every shop that sells lads' mags – publications which are deeply harmful to women – are opening themselves up to legal action".
A British exit from the EU would be "deeply harmful" for industry, the boss of one of the UK's largest manufacturing firms has warned.
This includes a view of gender and a view of nature that can be deeply harmful to the environment at large and our relationship with it.
Task Force (I serve on the board of the National L.G.B.T.Q. Task Force Action Fund), observed that Trump "has been playing deeply harmful games with L.G.B.T.Q.
The views expressed by Mr Sterling are deeply offensive and harmful".
Kash Mansori says we are currently going through "a deeply unfortunate and harmful bout of fiscal contraction … right when we should be doing exactly the opposite".
"The views expressed by Mr Sterling are deeply offensive and harmful," said Silver, in a strongly worded statement delivered from the podium at NBA headquarters in New York.
Prediction of multiple emissions of boiler such as NOX, SO2 and mercury accurately and quickly can help operating engineers understanding the power unit deeply and controlling harmful emissions efficiently.
But apart from the moral dimension (he called Mr Sterling's remarks "hateful opinions" and "deeply offensive and harmful"), was his decision also informed by commercial considerations, concerned that the NBA brand could be tarnished or that players could boycott games.
