Infelicitousness is a term that refers to something that is inappropriate, awkward, or unlucky. There are several synonyms for this word that can be used to convey the same meaning, such as ineptitude, inappropriateness, infeasibility, inopportuneness, awkwardness, clumsiness, or inconvenience. Each of these words can be used to describe a situation or behavior that is awkward, ill-timed, or simply not appropriate. For example, you might use the word ineptitude to describe a situation in which someone fails to perform a task correctly, or you might use the word infeasibility to describe a project that is not viable or likely to succeed. Regardless of which synonym you choose to use, they all describe something that is infelicitousness.