Worth pointing out, because when I saw this word while reading Hermann Hesse's Steppenwolf recently I did a double-take, that niggardly has absolutely nothing to do with "niggers".

Niggardly means "miserly" or "stingy". It is based on "niggard", not "nigger", which means the same - a miser, a stingy person. The roots of this word are:

Derived from the Old Norse verb nigla, meaning "to fuss about small matters". Cognate to the English word "niggle", which retains the original Norse meaning.

http://en.wiktionary.org/wiki/niggard has further information:

This word, along with its adverbial form niggardly, should be used with caution. Owing to the sound similarity to the highly inflammatory racial epithet nigger, these words can cause unnecessary confusion and unintentional offense. The word is not related to the word nigger (a corruption of the Spanish word negro, meaning "black"), though someone unfamiliar with the word niggardly might take offense due to the phonetic similarity between the words.

Talk about an unhelpful coincidence. I wonder how many words fall out of disuse not because of their meaning but because of their phonetic similarity to words considered offensive.