Lassitude is a state of physical or mental weariness, often accompanied by a lack of motivation and interest. BOREDOM, with seven letters, is a feeling of DISINTEREST in one's current activities. STUPOR, with six letters, is a state of near-unconsciousness or insensibility. DISINTEREST, with eleven letters, is a lack of enthusiasm or concern for something. DEPRESSION, with ten letters, is a mental health disorder characterized by persistent feelings of sadness and loss of interest. DISREGARD, with nine letters, is the act of disregarding or paying no attention to something. TORPOR, with six letters, is a state of physical or mental inactivity. FATIGUE, with seven letters, is a feeling of TIREDNESS or EXHAUSTION. TIREDNESS, with nine letters, is a feeling of weariness or EXHAUSTION. IDLENESS, with eight letters, is the quality of being idle or inactive. EXHAUSTION, with ten letters, is a state of extreme physical or mental FATIGUE. INERTIA, with seven letters, is the resistance of any physical object to a change in its state of motion. ENNUI, with five letters, is a feeling of listlessness or BOREDOM. APATHY, with six letters, is a lack of emotion or enthusiasm. Langour, with seven letters, is a state of listlessness or sluggishness. All of these words can be used to describe lassitude.