noun, noun or participle which takes 'suru', intransitive verb
A somewhat formal or literary term for a state of restless worry and impatience. Often used in the expression 焦慮する to describe being consumed by anxious impatience.
Unable to get results, he couldn't hide his look of anxious impatience.
事態の進展の遅さに、社長は日々焦慮している。
The president is growing increasingly impatient and worried every day over the slow progress of the situation.