usefulThese useful gadgets should find a home in every kitchen.
helpfulThey gave us some really helpful advice.
valuableHe was able to provide the police with some valuable information.
invaluableThe Internet is an invaluable resource for teachers.
constructiveIt was a very constructive discussion.
worthwhileIt's a difficult course but it's very worthwhile.
informativeIt's an interesting and highly informative book.
functionalThe furniture is functional, not fashionable.
utilitarianOn the shelves there is a mixture of utilitarian and decorative objects.
handyThat's a handy little gadget.
efficientThere has to be a more efficient way to handle the problem.
workingThe working hypothesis is that this is not cross-contamination.