They are formed by attaching the suffix -menteto the feminineform of the
corresponding adjective or past participle (or to the invariable form if the
adjective does not have a distinct feminine form). This corresponds to the
English adverbial ending ‘-ly’.
lenta + mente lentamente slowly
decidida + mente decididamente resolutely
feliz + mente felizmente happily
However, not all adverbs in -menteare adverbs of manner:
Hablaron solamente dos personas. (quantity adverb)
Only two people spoke.
Posteriormente se casaron. (time adverb)
They got married later.
Políticamente ha sido un desastre.(sentence adverb)
Politically it’s been a disaster
The suffix -mentecan also be added, although not randomly, to the
absolute superlative forms of adjectives (see 26.6.3):
clarísima + mente clarísimamente extremely clearly
Stress and written accents on adverbs ending in-mente
Both the -mentesuffix and the adjective from which the adverb is derived
are stressed independently. Therefore, an adjective that is normally written
with an accent is also written with an accent when it is made into an
adverb:
fácil + mente fácilmente easily
Two or more adverbs in succession
In written Spanish (and formal spoken Spanish), when two or more -mente
adverbs are joined by link words such as y, pero, oor ni, the -mentesuffix
is omitted from all but the last adverb in the sequence:
Hablaron lenta y gravemente.
They spoke slowly and gravely.
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Adverbs