He bought a luxury car out of vanity.

He collapsed from fatigue.

He is suspected of telling lies.

Nothing but nothingness was reflected in his eyes.

He was feeling a sense of exhaustion from work stress.

He refused my proposal.

His proposal was unilaterally rejected.

He is my powerful rival.

He was taken to the hospital for an acute myocardial infarction.

Unpreparedness is the greatest enemy, let's always be careful not to neglect caution.