Good vs. Evil

Adjective promoting or enhancing well-being
Cellphones in Haiti helped keep doctors ahead of a cholera epidemic, by tracking populations as they left the epicenter and alerting medics, as well as sending beneficial advice via texts.
Verb receive an advantage
benefit
Plenty of players benefit, or suffer, from the notion of clutch. No one would declare Willie Mays’s career a failure for his low postseason batting average, but Barry Bonds was dogged for much of his career because of it.
Adjective not dangerous to health
Can you imagine firefighters waving wands? Scientists have shown that a relatively benign electric field can extinguish fires.
Adjective real or genuine
bona fide
For some reason, maybe it had something to do with the imaginary waterspouts full of sharks sucked out of the Pacific Ocean, “Sharknado” became a bona fide social media phenomenon.
Noun payment or gift added to what is usual or expected
bonus
These days employees are expected to be available around the clock. If you take time off or don't work long hours you're seen as uncommitted, and can get left high and dry when bonus time comes around.
Adjective very bad or poor
dismal
The current drought in California has been 3 years in the making, as three successive winter wet seasons went by with below-normal precipitation. With such dismal numbers, water conservation is key.
Adjective having or showing a wish to do evil to others
malevolent
Forty years later, 'The Exorcist,' a grisly tale about the possession of a girl by a malevolent demon, has been revised and polished by author William Peter Blatty.
Verb speak about (someone) in a spitefully critical manner
A new documentary by ESPN Films aims to exonerate Steve Bartman, the fan maligned for interfering with a catch and dashing the Chicago Cubs' hopes of advancing to the finals.
Noun cancerous growth that is uncontrollable or resistant to therapy
malignancies
Dogs have been proven capable of sniffing out cancer, from its early stages to advanced malignancies. Researchers are piqued by what exactly the canines are detecting.
Verb avoid responsibilities by pretending to be ill
Laguerre Payen was sentenced to twenty-five years in jail for a planned terrorist attack. His trial was protracted until the judge determined if he was malingering.