unproductive

From un- +‎ productive.

• IPA^(key): /ˌʌn.pɹəˈdʌk.tɪv/

• Audio (US):

  (file)

• Rhymes: -ʌktɪv

unproductive (comparative more unproductive, superlative most unproductive)

1. Not productive; useless; fruitless.

   Juggling is an amusing pastime, but generally unproductive.

2. (linguistics, of affixes, mechanisms of word formation, etc) No longer used to produce new words (see examples).

• unproductive is much more common than nonproductive.

• nonproductive
• unyieldly

• unproductive time
• unproductively

• “unproductive”, in OneLook Dictionary Search.
• “unproductive”, in Merriam-Webster Online Dictionary, Springfield, Mass.: Merriam-Webster, 1996–present.
• “unproductive, nonproductive”, in Google Books Ngram Viewer.