The word "niggardous" is an adjective that means being stingy or miserly. However, some people might perceive the word as offensive because of its similarity to a racial slur. Hence, it is essential to use the word with caution. Some synonyms of the word "niggardous" could be tight-fisted, penny-pinching, parsimonious, thrifty, or frugal. These words are less likely to offend anyone while conveying the same meaning. Using appropriate synonyms can help you communicate your message effectively and avoid any inadvertent offence caused by certain words. Always remember to choose words carefully and be mindful of their connotations to avoid hurting anyone's sentiments.