disposed to take a favorable view of events or conditions and to expect the most favorable outcome.
reflecting a favorable view of events and conditions and the expectation of a positive outcome; demonstrating optimism: an optimistic plan.
of or relating to optimism.

Sometimes op·ti·mis·ti·cal.

Origin of optimistic

First recorded in 1840–50; optimist + -ic
Related formsop·ti·mis·ti·cal·ly, adverban·ti·op·ti·mis·tic, adjectivean·ti·op·ti·mis·ti·cal, adjectivean·ti·op·ti·mis·ti·cal·ly, adverbnon·op·ti·mis·tic, adjectivenon·op·ti·mis·ti·cal, adjectivenon·op·ti·mis·ti·cal·ly, adverbo·ver·op·ti·mis·tic, adjectiveo·ver·op·ti·mis·ti·cal·ly, adverbpre·op·ti·mis·tic, adjectivesem·i·op·ti·mis·tic, adjectivesem·i·op·ti·mis·ti·cal·ly, adverbsu·per·op·ti·mis·tic, adjectiveun·op·ti·mis·tic, adjectiveun·op·ti·mis·ti·cal, adjectiveun·op·ti·mis·ti·cal·ly, adverb
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for overoptimistic



excessively optimistic
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for overoptimistic



1845, from optimist + -ic. Related: Optimistical (1809); optimistically.

Online Etymology Dictionary, © 2010 Douglas Harper