妬ましい

1. Origins, structure, and basic meaning

• Structure: 妬ましい (ねたましい) is an i-adjective describing envy or jealousy toward another person's advantage.
• Basic usage: 才能が妬ましい predicates envy of someone's talent; 妬ましくなった reports a change into a jealous state.

2. Common pitfalls and similar expressions

• State adjective and change with くなる
  • The plain adjective describes the feeling itself, whereas the くなる pattern marks the onset of that feeling.