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孤僻

unsociable, withdrawn

k u ⁵ ⁵ pʰ i ⁵ ¹
adjective Rare #30,178
unsociable, withdrawn Describes someone who tends to avoid other people; it does not necessarily mean they have a mental-health condition.
CH: 他性格孤僻，不太喜欢参加聚会。
EN: He is withdrawn and doesn’t really like going to parties.

父亲愈来愈孤僻

Father is becoming increasingly withdrawn.

— 天使爱美丽 (2001)

Sounds similar to

孤寂 k u ⁵ ⁵ t͡ɕ i ⁵ ¹