"stiff increase" is a correct and usable phrase in written English.
You can use it to describe a dramatic increase in something. For example, "The stock market saw a stiff increase in prices after the announcement."
Among them is a stiff increase for taxes on gas and heating oil -- one of the main expenses for people like Mr. Mainka who own climate-controlled greenhouses.
The risks became starker when 50,000 people, mostly students, marched through the Whitehall government district on Wednesday to protest education spending cuts and the stiff increase in college tuition.
And to reduce the impact on the deficit, it also includes a stiff increase in the fee paid by oil companies into a liability fund, increasing the current eight cent-per barrel charge to 49 cents.
In such cases, the spreading width of the excitation cannot be reproduced and the polarizability as a function of the excitation energy displays a stiff increase around the predicted centroid energy of the giant resonance.
Club members, most speaking only on the condition that they not be identified, say that the Met has demanded a stiff increase in fees for their clubhouse, which really annoys them, as their club is 108 years old and they feel they have been there financially for the tough times.
So, if you are facing a stiff increase in your premium, you might want to shift to a lower cost plan instead.
The government also pledged to impose stringent water conservation in the north, as well as stiff increases in the price of water.
For years, ESPN and Fox Sports have infuriated cable operators by negotiating stiff increases in the fees paid to carry their networks.
Closing the budget defcit will involve much more; either raising taxes on the middle class, or dangerously stiff increases in marginal tax rates on the wealthy.
The 19 × 25-mil stainless steel wires, which were the most stiff, increased at rates between 75 and 84 cN/degree; the 14-mil austenitic nickel-titanium wires, which were the least stiff, increased at rates from 2.6 to 5.4 cN/degree.
The cut in fuel VAT runs directly counter to Tony Blair's windy rhetoric at this week's environment summit in New York, so Mr Brown should make up for it with stiff increases in other "green taxes".
