i-adjective
Obsolete adjective related to 執念 (しゅうねん, tenacity). Used in older texts for someone who is stubbornly persistent or tenacious. In modern Japanese, しつこい or 執念深い are more common.
See also: 執念 (しゅうねん)
古い小説に「執念い性格」という表現が出てくる。
In an old novel, the expression '執念い性格' (stubborn personality) appears.
Derived from 執念 (しゅうねん, tenacity) with the adjectival suffix い. The exact historical development is uncertain; the form is now obsolete.