shorter (comparative) shortest (superlative)
The word thrifty is short enough that the comparative and superlative forms are thriftier and thriftiest.
The comparative form of risky is riskier, and the superlative form is riskiest. The word risky is short enough to form the comparative and superlative forms this way. For longer words, you would need to precede the word with more (for comparative) and most (for superlative).
What's the comparative and superlative of the word "exact"
The comparative is greater and the superlative is greatest.
The comparative is sadder, and the superlative saddest.
The superlative is cloudiest; the comparative is cloudier.
The comparative is "luckier". The superlative is "luckiest".
fewer - comparative & fewest - superlative
comparative- smarter superlative- smartest
The comparative is later, and the superlative is latest