What is the exact meaning of the word "nemesis"?

There are two common uses of the word.

a. A source of harm or ruin

When it comes to writing, bad spelling has always been my nemesis.

b. An opponent that cannot be beaten or overcome.

Superman may have been the Man of Steel, but Kryptonite was his nemesis.

Nemesis is that which is always one step ahead of you, in reaching your goal. Not always an enemy.

Noun, from the Greek goddess of retribution and punishment.

A nemesis always prevails. The funny thing is, people that have a nemesis, KNOW it's their nemesis, and still can't overcome it, lol.

Every time I decide to diet, lasagna becomes my nemesis.

Nemesis refers an opponent or enemy of sorts, and is a Greek goddess of retribution.

E.g.

Laziness is my nemesis.

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A janitor (British English caretaker) is a person who takes care of a building, such as a school, office building, or apartment block. Janitors are responsible primarily for cleaning, and often (though not always) some maintenance and security. as an assistant, you'd be, ummm, assisting the janitor follow in his daily duties.

nem·e·sis -

something that a person cannot conquer, achieve, etc.:

"The performance test proved to be my nemesis."

enemy...... " At last, I met my nemesis in a showdown of wits"

a nemesis means an enemy. look it up at dictionary.com.