C2severe and difficult: The athlete was given a stiff punishment for using drugs.They are campaigning for stiffer penalties for people who drink and drive.There has been stiff opposition/resistance to the proposed tax increases.It's a stiff climb to the top of the hill.Some college courses have stiffer entry requirements than others.Both companies are worried about losing business in the face of stiff competition.Serious and severeSeverea stiff breeze/wind›a strong windWind and windsStormy weathera stiff drink, brandy, gin, etc.C2an alcoholic drink that is very strong: A stiff whisky - that's what I need.Alcohol - general words›A stiff price is very expensive: We had to pay a stiff membership fee to join the health club.Costing too muchExpensive and luxurious