invaluable
adjective
[ ɪnˈvaljʊ(ə)b(ə)l ]
• extremely useful; indispensable.
• "an invaluable source of information"
Similar:
indispensable,
crucial,
critical,
key,
vital,
irreplaceable,
extremely useful,
extremely helpful,
all-important,
vitally important,
of the utmost importance,
