ineffective, ineffectual, unable, impuissant, Impotent
Cinders are hot ashes, there is no antonym for this word.
No its not
absorb
Nonflammable.
This depends somewhat upon context. Sometimes potency refers to male fertility. At other times it refers to power or strength. A potent drink has a high alcohol content and is therefore strong. A potent drug is very effective.
A close antonym would be shrinkage.
unsurprised
rejected.
allows
plentiful
enlarge
Current or present is the closest antonym for the word former.
probly like profitable
Joyous might be a good one
Go or start or commence are antonyms of halt
sell
closed