attachment; tenacity of purpose
Refers to a strong emotional clinging or fixation, often with a nuance of stubborn persistence. Can be used for unhealthy obsession or determined focus depending on context.
He has a strong attachment to money.
If you let go of your attachments, you can live more easily.
固執 means stubbornly sticking to one's opinion or course of action, while 執着心 is more about emotional clinging to people, things, or desires.
Compound of 執着 (attachment, fixation) and 心 (heart, mind). The exact historical derivation is uncertain, but the combination naturally expresses a mental or emotional state of clinging.