different between precisely vs pleasantly

English

precise +? -ly

precisely (comparative more precisely, superlative most precisely)

(manner) In a precise manner; exactly.
Synonyms: exactly, incisively; see also Thesaurus:exactly
Antonym: imprecisely
(focus) Used to provide emphasis.

pleasant +? -ly

pleasantly (comparative more pleasantly, superlative most pleasantly)

In a pleasant manner; so as to achieve a pleasant result.
He smiled pleasantly at passersby.
They were pleasantly surprised at the result.
(degree) Lightly
(obsolete) Ludicrously.
- 1843, Thomas Carlyle, Past and Present, ch. 1, Midas
  In workhouses, pleasantly so named, because work cannot be done in them.

Webster, Noah (1828) , “pleasantly”, in An American Dictionary of the English Language

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