can't do without
- essentialFundamentally necessary
- indispensableUtterly required, irreplaceable
- vitalEssential or sustaining existence
- necessaryIndispensable, cannot omit
- crucialOf supreme importance
lifeline · depend · rely · need · crave · must-have · staple · backbone · cornerstone · oxygen · survival · addicted · hooked · attached · cling · requirement · fundamental · critical
necessity/dispensability
can't do withoutcan do without
Manage without needing
dispensable · expendable · unnecessary · nonessential · superfluous