Nasty - pleasant, big - small, nice - bad/disgusting, difficult - easy, interesting - boring, fat - thin, small - big, good - bad, long - short, thin - fat, bad - good, short - long, boring - interesting
long - longer, small - smaller, nice - nicer, fat - fatter, big - bigger, thin - thiner, nasty - nastier,eay - easier, interesting - more insteresting, difficult - more difficult, boring - more boring, good - better, bad - worse, happy - happier, lucky - luckier, many - more, little - littler (или less - зависит от значения), fascinating - more fascinating