Суеревие is the Russian word for superstition. This word declines as such:

A superstition is the belief in the supernatural beings or events. Most all countries have them and they are rooted into their cultures. Some of the American ones are don’t break a mirror unless you want seven years of bad luck. If a black cats crosses your path you are also going to have bad luck. We have some rhymes to help people remember them as well, such as step on a crack will break your mother’s back. Some of Russia’s superstitions are: On exam day you shouldn’t wear anything new, make your bed or cut your fingernails, a funeral procession is good luck unless you cross its path. Both the US and Russia believe that breaking a mirror is bad luck. For Russians looking into a broken mirror is also is bad luck. Nowadays superstitions are not as highly regarded but certain ones are still believed by older generations. Growing up as Christian I was taught that superstitions are fun to think about but not something to live by because the supernatural of that sort is not real or worth worry about it.