indispensable
definition
absolutely necessary or essential
example
In today's digital age, having a strong internet connection is indispensable for remote work.
synonyms
essentialnecessaryvital
word origin — from late Middle English, borrowed from Latin 'indispensabilis', meaning 'not able to be dispensed with'; composed of 'in-' (not) + 'dispensabilis' (able to be dispensed).