• crestfallen, despondent, disheartened, dispirited, distressed
• despondently, dispiritedly, pusillanimously
• daunting, dismaying, dispiriting
• discouragingly, dismayingly
• disheartened, downhearted
• to daunt, to depress, to dishearten, to dismay, to dispirit, to distress
• to hold up, to keep one's end up, to keep up one's spirits
• be of good comfort!, keep up your courage!
• to keep one's pecker up