他的行為既不違法也不完全合乎道德，介於一種灰色地帶之間。

His actions are neither illegal nor entirely ethical, falling somewhere in a gray area.

Source: Tatoeba

Sentence Composition

1 他 tā
  1. (third-person singular) (since the early 20th century, usu. male) he; him; his
  2. (bound form) other; another; some other (as in 他日 tārì and 他人 tārén)
=2 的 de
  1. of; ~'s (possessive particle)
  2. (used after an attribute when it modifies a noun)
  3. (used at the end of a declarative sentence for emphasis)
  4. (used after a noun, verb or adjective to form a nominal expression, as in 皮革的 pígéde "one made of leather" or 跑堂儿的 pǎotángrde "a waiter (literally, one who runs back and forth in a restaurant)" or 新的 xīnde "new one")
  5. also pr. dì or di in poetry and songs
=2 的 dī a taxi; a cab (abbr. for 的士 dīshì)
=2 的 dí really and truly
=2 的 dì (bound form) bull's-eye; target
3 行為 xíngwéi
  1. action
  2. conduct
  3. behavior
  4. activity
4 既 jì
  1. already
  2. since
  3. both... (and...)
5 不 bù
  1. no; not so
  2. (bound form) not; un-
6 違法 wéifǎ
  1. illegal
  2. to break the law
7 也不 yěbù
  1. neither
  2. nor
8 完全 wánquán
  1. complete; whole
  2. totally; entirely
9 合乎 héhū to accord with; to conform to
10 道德 dàodé
  1. virtue
  2. morality
  3. ethics

classifier: 種
11 介於 jièyú
  1. between
  2. intermediate
  3. to lie between
12 一種 yīzhǒng one kind of; one type of
13 灰色地帶 huīsèdìdài gray area
14 之間 zhījiān
  1. (after a noun) between; among; amid
  2. (used after certain bisyllabic words to form expressions indicating a short period of time, e.g. 弹指之间 tánzhǐzhījiān)