Antonym: needless. Similar words: heedful, handful, mindful, need, dreadful, needy, needs, mindfully. Meaning: ['nɪːdfʊl] 
adj. necessary for relief or supply.
adj. necessary for relief or supply. 
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31. As a result, it is very needful to use a protector which can monitor malfunction of three-phase motor correctly and fleetly.
32. Food, clothing and shelter are needful for the maintenance of health.
33. Q 3: What needful conditions do you think a DJ shoule have?
34. At the same time, much needful information was obtained from Internet.
35. In order to live, I must have what you call " the needful ", which I can got only by working.
36. It is needful for fair competition among foreign to unify two sets of income tax law.
More similar words: heedful, handful, mindful, need, dreadful, needy, needs, mindfully, unmindful, regardful, needed, needle, dreadfully, needled, in need of, needless, weak-kneed, neediness, needlessly, needless to say, meet the needs of, pins and needles, on pins and needles, hypodermic needle, at full speed, red flag, red-faced, unlooked-for, dried fruit, hundredfold.