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littler, littlest or less, least
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).
"Higher" is the comparative of high. The superlative is highest.
absolute adjectives
The comparative and superlative words of little are littler and littlest or little, less, least.
lazier and laziest
Since the word "dangerous" is considered a long adjective (of 3 or more syllables), the words "more" and "most" are used to form the comparative and superlative forms. The comparative form is more dangerous. The superlative form is most dangerous.
The comparative form is more respectful and the superlative is most respectful. In general, words of three or more syllables use more and most to form the comparative and superlative forms, because adding -er or -est as a suffix (which works well with short words) tends to result in a word that is too long and difficult to pronounce.
'Next' is a superlative; it means 'nearest'. The positive is therefore 'near' and the comparative is 'nearer'.
last
harmful
easier and easiest