The phrase "excessively hard" is correct and usable in written English.
It can be used to describe something that is overly difficult or challenging.
Example: "The exam was excessively hard, leaving many students feeling overwhelmed."
Alternatives: "unduly difficult" or "overly challenging."
Technologia says that the economic crisis is placing pressure on employees at all levels to work excessively hard and take on more overtime.
He punished with the utmost severity those who resisted his decrees and laws, and even his Ottoman contemporaries considered him excessively hard.
The track's smooth surface is not excessively hard on the tires, so the teams will use medium and soft rubber compounds — the same kind used the last time the series raced at the Nürburgring, in 2011.
The fact is that it is excessively hard for the vast majority of people from ethnic minorities, and from economically disadvantaged backgrounds, to attain the cushy lifestyle that one was born into and takes for granted.
Wearing layered black tops and shredded skirts by Madeleine Walach, the dancers cross the stage with skittish steps and slicing arms, trying excessively hard to appear more animal than human.
Orlando's Tracy McGrady, emerging as the top swingman in the game, nearly went toe-to-toe with Martin this season after he was the victim of an excessively hard foul.
She helped his research and published her own book, called I Married A Best Seller, about her life with the writer she called "temperamental, ruthless, sensitive, impatient, emotional, unreasonable, demanding, self-centred, excessively hard-working, precise, pig-headed, fastidious, fanatically clean and manically tidy".
The second element of Fed policy making is risk assessment: if one steps on the brakes too hard, one risks excessively high unemployment; too gently, one risks inflation.
As a way of neutralizing the "happily ever after" myth that so many people seem to be so fond of, over the years we have emphasized, perhaps excessively, the hard work required to create and maintain a great relationship.
Make sure the grips are not excessively worn, hard or slick.
"Preoccupied" individuals got caught up in the negative aspects of their past, telling excessively long, hard-to-follow stories.
