The Japanese adjective '青い (あおい)' primarily means 'blue'. It is used to describe objects, colors, or even emotions that are associated with the color blue. For example: the sky is blue「空は青い」(そらはあおい). This adjective can also metaphorically describe something as being inexperienced or unripe, such as in the phrase '青い考え (あおいかんがえ)' meaning 'immature thoughts'. However, this secondary usage is less common and context-dependent. Another example: the sea looks blue today「今日の海は青い」(きょうのうみはあおい).