Context Clues!

The mother was determined to prove her son's innocence; the father was "resolute" as well.

After being ill and unable to eat for three days, Beverly had a "voracious" appetite.

The good guy in the story was strong and kind, unlike the "villain".

 Candles, flashlights, and lamps "illuminate" the room. 

The tornado "annihilated" the whole town to the point that nothing was left standing. 

Jack "labored" at his job all day while Peggy rested in bed.

Some people feel "perplexed" by brain teasers, while others figure them out quickly.

"Precipitation", such as rain and snow, falls from the sky.

The sun made the lake water "shimmer".

His "rancor", or hatred, of his brother has caused him to live his life as a lonely person.

Katie appeared "infallible" in math class because she had never gotten a problem wrong. 

A "sleuth", such as Sherlock Holmes, can be very helpful in solving crimes.