Forming the Comparative and the Superlative of Adverbs

The comparative ‘more’ and the superlative ‘most’ are used with adverbs ending in -ly. 

Examples:

• We should take this more seriously. 
• The most hastily written document often has mistakes. 

The comparative suffix -er and the superlative suffix -est are used with adverbs not ending in -ly.

It was the hardest thing I’d ever done. You can proofread for readability much faster with Readable. As with most grammatical rules, there are some exceptions. The irregular forms are as follows: Badly -> worse -> worst Little -> less -> least.