躊躇

tyuutyo hesitation, indecision, waffling, vacillation

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It's a simple enough concept, but I think the characters are amazingly beautiful (in their complexity). Interestingly enough, both of the characters can be used for the same verb, ためらう tamerau, written as 躊う, 躇う, or even as 躊躇う, meaning to hesitate or waver.