Translation guide
To express the idea of being curious in Japanese, you typically use adjectives or verbs that describe a state of wanting to know or learn. The most common and natural ways are using 好奇心 (こうきしん) with verbs like ある or 旺盛 (おうせい), or using the adjective 知りたがる (しりたがる). The choice depends on whether you're describing a general trait or a specific instance of curiosity.
Describing someone who is curious by nature, or expressing that you are curious about something in general.
He is curious.
I am curious about new cultures.
Means 'full of curiosity' or 'very curious'. 旺盛 (おうせい) means 'vigorous' or 'abundant'. This emphasizes a strong, active curiosity.
Children are very curious.
A verb meaning 'to want to know' or 'to be eager to learn'. It often implies a visible, sometimes childlike curiosity. It can sound slightly negative if the person is being nosy.
She wants to know everything. (She is very curious.)
Expressing curiosity about a particular topic, event, or fact.
Literally 'I want to know about ~'. This is a very natural and direct way to express curiosity about something specific.
I'm curious about that incident.
Means 'to be interested in ~'. While not a direct translation of 'curious', it is often used in similar contexts and is very common.
I'm curious about his past.
Means 'to be on one's mind' or 'to be curious/worried about'. It implies a lingering curiosity, often about something unclear or unresolved.
I'm curious about that shop's secret.
Using 'curious' to describe something odd or unexpected, not a person's desire to know.
Means 'strange', 'odd', or 'curious' in the sense of being peculiar. This is the most direct adjective for this meaning.
That's a curious story.
Means 'mysterious', 'wonderous', or 'strange'. It often carries a nuance of marvel or inexplicability.
It was a curious incident.
Do not try to translate 'be curious' word-for-word as 好奇心である or similar. The natural expressions use 好奇心がある (to have curiosity) or verbs like 知りたがる.
好奇心がある specifically means 'curious' and implies a desire to learn or know. 興味がある means 'interested' and is broader, covering hobbies, preferences, etc. For pure curiosity, 好奇心がある is more precise.