unreliable

From un- +‎ reliable.

• (Received Pronunciation) IPA^(key): /(ˌ)ʌn.ɹɪˈlaɪ.ə.bl̩/
• (General American) IPA^(key): /ˌʌn.ɹəˈlaɪ.ə.b(ə)l/

• Audio (General American):

  (file)

• Rhymes: -aɪəbəl
• Hyphenation: un‧re‧li‧a‧ble

unreliable (comparative more unreliable, superlative most unreliable)

1. Not reliable.

   Synonyms: flakey, sporadic, undependable

   Antonym: reliable

   • 2018 January 4, Janie Tankard Carnock, “Frigid Baltimore City schools: The racism we haven’t confronted”, in CNN‎^[1]:

     The opposite issue emerges in the summer when students face scorching temperatures with unreliable or nonexistent air conditioning.

   • 2020 May 6, Philip Haigh, “Just one more stop on the long journey to HS2 fulfillment [sic]”, in Rail, page 65:

     "Operating the WCML at this intensity makes it challenging to maintain acceptable performance levels, resulting in a frustratingly unreliable service for passengers. Minor disruption can escalate into significant delays because a train running only a few minutes late can miss its slot across a junction, resulting in a snowballing effect across the network."

• unreliably
• unreliable narrator

• unreliability

• Bleulerian