温い

1. Origins, structure, and basic meaning

• Structure: 温い(ぬるい) is an い-adjective meaning that tea, water, or another substance is lukewarm rather than hot or cold.
• Basic usage: A change of state appears in お茶が温くなる, while a present temperature appears in 水が少し温い.

2. Common pitfalls and similar expressions

• Temperature relative to expectation
  • It can describe hot tea that has cooled or water that is not as cold as expected.
• Adverbial form
  • Before なる, change the final い and use 温くなる.