Grat
Mal
bene
100

This word's definition is a lack of being thankful.  

What is ingratitude?

100

These two mal words are synonyms for each other and mean evil or hateful.  

malicious and malevolent.

100

This word's synonym is kind.

What is benevolent?

200

One of this word's synonyms is free.

What is gratis?

200

This word has a definition of badly adjusted.

What is maladjusted?

200

This word means an advantage.

What is benefit?

300

One of this word's antonyms is thankless.

What is grateful?

300

One of this word's synonyms is breakdown.  

What is malfunction?

300

This word's antonym is bride.

What is benedict?

400
This word has a definition of an ungrateful person.

What is an ingrate?

400
One of this word's synonyms is misconduct.
What is malpractice?
400
One of this word's synonyms is donor.

What is benefactor? 

500

This word means to give someone good wishes.  

What is congratulate?

500

This is a fictional Disney character whose name contains the root that means bad.

Who is Maleficient?

500

This is the name of a dog food that contains the root that means good.

What is Beneful?