1. 无力；困乏；倦怠
Lassitude is a state of tiredness, laziness, or lack of interest.

1. weakness characterized by a lack of vitality or energy

Synonym: inanitionlethargyslackness

2. a feeling of lack of interest or energy

Synonym: languorlistlessness

3. a state of comatose torpor (as found in sleeping sickness)

Synonym: lethargysluggishness