Younger is the comparative form. Youngest is the superlative form.
put
tougher toughest
Comparative: more affectionate and more interesting Superlative: most affectionate and most interesting
For adjectives of three syllables or more, put "more" in front of them for the comparative and "most" for the superlative.
It should be most costly.
"Less" is the comparative degree of little. The superlative degree is least.
comparative : purer superlative : purest
Mad, madder, maddest.
The comparative degree of cheerful is more cheerful.Its superlative degree, then, is most cheerful.
Comparative is wealthier and the superlative is wealthiest
Comparative is wealthier and the superlative is wealthiest
Comparative: fouler Superlative: foulest
The comparative degree is bigger.
The comparative degree is wider.
The comparative degree is 'more magnificent' and the superlative degree is 'most magnificent'.
comparative=more superlative=much