high morale; heightened fighting spirit
Describes a state where morale or fighting spirit is very high. Often used in military, sports, or organizational contexts.
The players' morale is high before the match.
A team with high morale can face any difficulty.
士気 means 'morale' or 'fighting spirit' itself, while 士気旺盛 describes the state of that morale being very high.
旺盛 means 'vigorous' or 'abundant' and can be used with other nouns like 食欲旺盛 (hearty appetite). 士気旺盛 is a specific compound for high morale.
Compound of 士気 (morale, fighting spirit) and 旺盛 (vigorous, abundant).