1) be fussy about one's personal apperance

过于讲究外表
3) He is careless about his appearance.

他不讲究外表。
4) He is extremely careful about his appearance.

他十分讲究外表。
补充资料:过于
副词,表示程度或数量过分;太:~劳累丨~着急丨~乐观。
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