This verse again uses a number of uncommon words. The form seems convoluted when read, but if we imagine it spoken, it follows the pattern of Jesus's humor. We can easily see how it would be acted out with two choking hands playing the roles of "worry" and "deceit."
The Greek word translated as "unfruitful" also means "unprofitable." This connects Jesus's idea of "evil" as worthlessness to the idea of productivity. The message must be productive. The word translated as "becometh/making" means "to produce" when applied to things. I suspect the word "unfruitful" also had a sexual meaning the puts the punch in it as the punchline.
Christ's Words in Matthew as a Guide to 40 Days of Prayer.