1.  Adverbs derived from adjectives of the First and Second Declensions form the Positive by changing -i of the Genitive Singular to -e; those derived from adjectives of the Third Declension, by changing -is of the Genitive Singular to -iter; as,—­

carus, care, dearly; pulcher, pulchre, beautifully; acer, acriter, fiercely; levis, leviter, lightly.

  a.  But Adjectives in -ns, and a few others, add -er (instead of -iter),
  to form the Adverb; as,—­

sapiens,    sapienter, wisely;
sollers,    sollerter, skillfully.

Note audax, audacter, boldly.

2.  The Comparative of all Adverbs regularly consists of the Accusative Singular Neuter of the Comparative of the Adjective; while the Superlative of the Adverb is formed by changing the -i of the Genitive Singular of the Superlative of the Adjective to -e.  Thus—­

(carus) care, dearly, carius, carissime. (pulcher) pulchre, beautifully, pulchrius, pulcherrime. (acer) acriter, fiercely, acrius, acerrime. (levis) leviter, lightly, levius, levissime. (sapiens) sapienter, wisely, sapientius, sapientissime. (audax) audacter, boldly, audacius, audacissime.

Adverbs Peculiar in Comparison and Formation.

77. 1., well, melius, optime.
  male, ill, pejus, pessime.
  magnopere, greatly, magis, maxime.
  multum, much, plus, plurimum.
  non multum, little, minus, minime.
  parum,
  diu, long, diutius, diutissime.
  nequiter, worthlessly, nequius, nequissime.
  saepe, often, saepius, saepissime.
  mature, betimes, maturius, maturrime.
          
                                        maturissime.
  prope, near, propius, proxime.
  nuper, recently, ——­ nuperrime.
  ——­ potius, rather, potissimum,
          
                                        especially.
  ——­ prius, previously, primum, first.
                            before,
  secus, otherwise, setius, less.

2.  A number of adjectives of the First and Second Declensions form an Adverb in -o, instead of -e; as,—­

crebro, frequently; falso, falsely;
continuo, subito, suddenly;
immediately;
raro, rarely, and a few
others.

a. cito, quickly, has -o.

3.  A few adjectives employ the Accusative Singular Neuter as the Positive of the Adverb; as,—­