Question

你看过小张的女朋友吗？Yes. Neither tall nor short, neither fat nor thin- she's just right. (patern not 半~不~) CCP 20

Accepted Answer

见过，不高不矮，不胖不瘦，很招人喜欢。不~不~ used with two monosyllabic adjectives or location words with opposite meanings to indicate something is "just right," or sometimes used to indicate a dissatisfying intermediate state. It is also used with antonymic monosyllabic verbs or morphemes to indicate "if not... will not...," or used with two monosyllabic synonyms as an emphatic form of "not."

Front	你看过小张的女朋友吗？ Yes. Neither tall nor short, neither fat nor thin- she's just right. (patern not 半~不~)
Back	见过，不高不矮，不胖不瘦，很招人喜欢。不~不~ used with two monosyllabic adjectives or location words with opposite meanings to indicate something is "just right," or sometimes used to indicate a dissatisfying intermediate state. It is also used with antonymic monosyllabic verbs or morphemes to indicate "if not... will not...," or used with two monosyllabic synonyms as an emphatic form of "not."
Page	CCP 20

Monosyllabic Or 你看过小张的女朋友吗 Tall Short Fat Thin She's