疑心

1. Origins, structure, and basic meaning

• Structure: 疑心 is read ぎしん.
• Basic usage: It refers to a suspicious state of mind in which a person or explanation is difficult to trust.

2. Common pitfalls and similar expressions

• Suspicion arising
  • 疑心が生じる suits a situation in which suspicion newly appears.
• Suspicion deepening
  • 疑心が深まる describes existing suspicion becoming stronger.