Definition of pessimistic adjective from the Oxford Advanced American Dictionary

 

pessimistic

 adjective
adjective
NAmE//ˌpɛsəˈmɪstɪk//
 
pessimistic (about something)
 
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expecting bad things to happen or something not to be successful; showing this They appeared surprisingly pessimistic about their chances of winning. a pessimistic view of life I think you're being far too pessimistic. opposite optimistic
pessimistically
 
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NAmE//ˌpɛsəˈmɪstɪkli//
 
adverb
See the Oxford Advanced Learner's Dictionary entry: pessimistic