The word "needed" refers to something that is necessary or required. There are several synonyms for this versatile word, including essential, crucial, imperative, mandatory, and vital. These words all indicate that something is required or necessary in order for something else to occur. Other synonyms for "needed" might include required, necessary, requisite, indispensable, and compulsory. Depending on the context, some of these synonyms might be more appropriate than others. For example, "essential" might suggest that something is absolutely necessary, while "mandatory" might suggest that something is required by law or regulation. Regardless of which synonym is used, each one underscores the importance of the subject at hand.