1. A method, implemented by an information handling system that includes a memory and a processor, that improves a question answering (QA) system by reducing a number of vague questions submitted to the QA system, the method comprising: receiving a question that is submitted to the QA system; performing a vagueness question analysis on the question, wherein the vagueness question analysis results in a vagueness score, and wherein the analysis further: increases the vagueness score based on a set of linguistic features including a prepositional phrase in the question; increases the vagueness score based on the set of linguistic features including a firm superlative in the question; decreases the vagueness score based on the set of linguistic features including an arguable superlative in the question; and decreases the vagueness score based on the set of linguistic features including a referential pronoun in the question; submitting the question to the QA system in response to the vagueness score reaching a threshold value that indicates a lack of vagueness in the question; and inhibiting submission of the question to the QA system in response to the vagueness score failing to reach the threshold value.