Which question isn't grammatically correct?

How can we describe these body parts?

What is the opposite of the adjective attractive?

Which adjective best completes this sentence?

His grandfather is very ..., he gives money to all his grandchildren.

Which adjectives have a positive meaning and which ones a negative meaning?

If you feel lonely, you don't need anyone to talk to.

How to say wredny, złośliwy, skąpy in English using only one adjective?