MODIFICATIONS.
Adverbs have no modifications, except that a few are compared, after the manner of adjectives: as, soon, sooner, soonest; often, oftener, oftenest;[310] long, longer, longest; fast, faster, fastest.
The following are irregularly compared: well, better, best; badly or ill, worse, worst; little less, least; much, more, most; far, farther, farthest; forth, further, furthest. Rath, rather, rathest, is now used only in the comparative.