This is a grammar rule some people seem to forget: we never use double comparatives or double superlatives.

A comparative is used to compare two things, and adjectives and adverbs can be modified to reflect the comparison by adding an ‘-r’ or ‘-er’ to the end: clear = clearer; dry = drier; wide = wider.

When an adjective or adverb is long or sounds awkward with the additional ‘-r’ or ‘-er’, we use the comparative adverb ‘more’: more beautiful (because beautifuler is both awkward and sounds terrible); more sensitive; more orderly.

We NEVER say ‘more clearer, more drier, more wider’.

A superlative is used when comparing three or more things, and adjectives and adverbs are mostly modified by using the ‘-est’ suffix: slowest, fastest, driest, clearest, liveliest.

When adjectives or adverbs are long or sound awkward with the additional ‘-est’, we use the superlative adverb ‘most’: most beautiful; most destructive; most sentimental; most freakish; most frightening.