1. equal to particular amount: equivalent in value to a particular amount
–> How much is it worth?
–> a painting worth thousands
2. important enough to justify something: important, large, or good enough to justify something
–> His friendship is not worth having.
1. deserving: fully deserving something, usually as a suitable reward for merit or importance
–> That remark is not worthy of a reply.
2. respectable: morally upright, good, and deserving respect
–> a worthy person
Microsoft® Encarta® 2009. © 1993-2008 Microsoft Corporation. All rights reserved.
Considering the references from Encarta Dictionary (posted above), Merriam-Webster and Wiktionary, I found that the adjective worth means mentioning a specific value of a thing (to a certain acceptable level), while worthy means emphasizing that same value with a higher importance, deserving more attention (compared to worth).
In my opinion, we should choose worth when we would like to value something over a certain level of quality, however, we might as well choose worthy to describe a thing which level is way above other things if compared using the same standard.
- This desktop computer is worth buying in the $400 price-range.
- That brand of desktop computer is worthy to have the best-bang-for-the-buck award since it offers higher specifications and higher quality compared to the other computers on the same price-range.