Collocations for optimism - noun

considerable, great, tremendous (esp. BrE)
sunny (esp. AmE)
some
cautious, guarded
false, misplaced
Her optimism turned out to be misplaced.

naive (esp. AmE)
early, initial
By 1960, the initial optimism had evaporated.

renewed

wave
The news caused a wave of optimism.

note
There was a note of optimism in his voice.

express
share
I find it hard to share his optimism.

prevail (esp. AmE), reign
Despite the crisis, a cautious optimism reigned.

evaporate

with optimism
We can look to the future with considerable optimism.

optimism about, optimism over
The government expressed optimism about the success of the negotiations.

optimism among
renewed optimism among mortgage lenders

optimism for
great optimism for the future

cause for optimism, grounds for optimism, reason for optimism
There are now very real grounds for optimism.

full of optimism
When the 1970s began, we were still full of optimism.

a mood of optimism, a sense of optimism, a spirit of optimism