'worthy topic' is a correct and usable phrase in written English.
You can use it as a stand-alone phrase or as part of a sentence to indicate that something is a worthwhile or important subject to discuss. For example, "This is a worthy topic to consider for our next meeting."
This is certainly a worthy topic for conversation.
It mulls the worthy topic of Obama's response to the economic crisis.
Mr. Fast said that his dealer's invitation to Frieze sent him seeking a worthy topic; pornography won out.
So while transforming the lives of future generations through technology is a worthy topic for debate, we might well ask what a gathering that is so grossly gender-unbalanced is likely to do to close the worrying digital divide between the sexes globally.
Therefore, chronicization of migraine is a worthy topic of further investigation.
Flags and islands would seem to be worthy topics.
SIR - I was happy to learn that the American Economic Association's annual meeting in New Orleans considered, among other worthy topics, the market for paid sex ("Economics focus", January 19th).
They can inspire illuminating perspectives on worthy topics, or they can be little more than knee-jerk pretexts for music publishers, presenters and record labels to fetishize round numbers in the name of sales, with musicologists gratefully riding their coattails.
All are worthy topics for a novel to tackle, (though maybe not for one novel to tackle), but Franzen reneges on the Contract by devoting huge numbers of pages to browbeating discussions of these issues.
Those are all worthy topics but there is only one place to start and when Martin Atkinson blew his final whistle and a heaving White Hart Lane exploded with joy, the sight of Tottenham's players queueing up to mob Harry Kane said everything.
