pessimistically
Adverb
Meaning
with pessimism; in a pessimistic manner
Source: WordNetSynonyms
sadly
negatively
desperately
darkly
miserably
cynically
grimly
doubtfully
gloomily
drearily
dismally
worryingly
disapprovingly
morosely
desolately
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Antonyms
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Even the closest relationships that I have I know could potentially fall away. That's not to speak pessimistically or negatively about those relationships. In a weird way, it's the opposite. I value them.
he evaluated his chances for survival rather pessimistically