「不方便」的相反詞是「方便」。

The opposite of "inconvenient" is "convenient".

Source: Tatoeba

Sentence Composition

1 不方便 bùfāngbiàn
  1. inconvenience
  2. inconvenient
=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 相反 xiāngfǎn
  1. opposite
  2. contrary
4 詞 cí
  1. word
  2. statement; speech; lyrics

classifier: 首
=5 是 shì
  1. to be (followed by substantives only)
  2. correct; right; true
  3. (respectful acknowledgement of a command) very well
  4. (adverb for emphatic assertion)
=5 是 shì variant of 是 shì
6 方便 fāngbiàn
  1. convenient; suitable
  2. to facilitate; to make things easy
  3. having money to spare
  4. (euphemism) to relieve oneself