The word "vague" relates to a concept or idea that is not clearly defined or expressed. Synonyms for this word include ambiguous, unclear, uncertain, indistinct, and hazy. Other related words include nebulous, elusive, fuzzy, murky, and obscure. These words can be used interchangeably to convey a lack of clarity, specificity, or precision in understanding or communicating a particular concept. Although these words have similar meanings, they can be used differently depending on the context and tone of the sentence. Choosing the right synonym can help to add depth and clarity to your writing and improve the overall impact of your message.