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opt out (v)
optical (adj)
optical illusion (n)
optical instrument (types of)
optical microscope (n)
optimal (adj)
optimism (n)
optimist (n)
optimistic (adj)
optimistically (adv)
optimize (v)
optimum (adj)
optimum (n)
option (n)
optional (adj)
optional extra (n)
opulence (n)
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optimistic (adj)
Synonyms: hopeful, positive, bright, cheerful, expectant, sanguine, confident, buoyant, enthusiastic

Antonym: pessimistic
Encarta® World English Dictionary [World English Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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