Complete the series : kind - kinder - kindest ; fat - fatter - fattest ; heavy - ________ - ________. (Fill in the blanks with right forms)

The correct answer is 'heavier - heaviest'.

Key Points

• ​The comparative degree is generally formed by adding '-er' to the end of the adjective followed by 'than'. This is the case with monosyllabic adjectives.
  • For example:- happier.
  • On the contrary, in the case of polysyllabic adjectives, the adjectives remain the same and use the word 'more' before the adjective.
    • For example:- more beautiful.
• ​The superlative degree is generally formed by adding '-est' to the end of the adjectives.
• Article 'the' is used before every superlative degree word.
  • For example:- The happiest place.
• For the given word i.e. heavy the degrees are given below:
  • Heavy - Heavier - Heaviest.

Hence the answer will be 'heavier - heaviest'.