Answer: optimist

AnswerCrossword Clue
OPTIMIST

One with high hopes

OPTIMIST

Voltaire's Dr. Pangloss, e.g.

OPTIMIST

Glass-half-full person

OPTIMIST
Hopeful soul
OPTIMIST
Prisoner of hope
OPTIMISTOne perpetually full of hope
OPTIMISTBastille "How am I gonna be an ... about this?"
OPTIMIST"A guy that has never had much experience": Don Marquis
OPTIMISTHis glass is half full
OPTIMISTSanguine one
OPTIMISTRose-colored glasses wearer
OPTIMISTOne with rose-colored glasses
OPTIMISTPositive thinker.
OPTIMISTOwner of a hope chest.
OPTIMISTDr. Pangloss, for example.
OPTIMISTOne with a positive outlook
OPTIMISTMurphy, per O'Toole
OPTIMISTDr. Pangloss, for one
OPTIMISTSunny side seer
OPTIMISTWearer of rose-colored glasses