Synonyms of needed

1 Syllable
sans, sought
2 Syllables
lacking, right-hand, wanted, bullseye, wanting, righthand, vital, needful, devoid
3 Syllables
required, requested, essential, bottom-line, life-or-death, desired
4 Syllables
bottomline, necessary, name-of-the-game, coal-and-ice
5 Syllables
pre-requisite, indispensable