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Definition of needful : 1. Full of need; in need or want; needy; distressing.
2. Necessary for supply or relief; requisite.

Synonyms:

essential, requisite, infallible, necessary, mandatory, unavoidable, important, needed, undeniable, required, compulsory, indispensable, inevitable

expectant, hopeful, itching, ardent, greedy, yearning, lusting, covetous, amorous, hungry, urgent, desirous, fond, acquisitive, eager, passionate, longing, thirsting, hankering, grasping

Usage examples:

• And so full am I of the knowledge of that Place, that scarce can I believe that none here know; and because I have such difficulty, it may be that I speak over familiarly of those things of which I know; and heed not to explain much that it is needful that I should explain to those who must read here, in this our present day. - "The Night Land", William Hope Hodgson.
• To bound the regions is of less importance than to understand why they exist- less needful to remember, more needful to understand. - "Manual of American Grape-Growing", U. P. Hedrick.
• Having everything needful in hand, the hunters took their way toward the large garden. - "The Bishop and the Boogerman", Joel Chandler Harris.