This is the 7531st most frequent Japanese word.
内気
Shy or introverted.
Describes a personal trait where the individual is shy or reserved.
彼はとても内気で、初対面の人とは話すのが苦手です。
He is very shy and finds it difficult to talk to people he meets for the first time.
Used to characterize someone as being shy, especially in social settings.
私の内気な友達は、人前で話すのが得意ではありません。
My shy friend is not very good at speaking in front of people.
Points to a personality trait of shyness affecting preferences in social encounters.