unreliable

un- +‎ reliable

• Audio (US)

  (file)

unreliable (comparative more unreliable, superlative most unreliable)

1. Not reliable.
   • 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."

• flakey
• sporadic

• reliable

• unreliably
• unreliable narrator

• unreliability

• Bleulerian