/ ɪnˈvæljuəbl; NAmE / adjective
invaluable (to / for sb/sth) | invaluable (in sth) extremely useful
SYN valuable :
invaluable information
The book will be invaluable for students in higher education.
The research should prove invaluable in the study of children's language.
—compare valuable
HELP NOTE : Invaluable means 'very valuable or useful'. The opposite of valuable is valueless or worthless .