unreliable

English

un- +‎ reliable

unreliable (comparative more unreliable, superlative most unreliable)

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."

not reliable

Albanian: i pasigurt m
Basque: ganoragabe, ganorabako
Belarusian: ненадзе́йны (njenadzjéjny)
Bulgarian: ненадежден (bg) (nenadežden)
Chinese:
Mandarin: 不可靠的
Czech: nespolehlivý m
Danish: upålidelig
Dutch: onbetrouwbaar (nl) m
Esperanto: nefidinda
Finnish: epäluotettava (fi)
French: non-fiable
German: unzuverlässig (de)
Greek: αναξιόπιστος (el) (anaxiópistos)
Haitian Creole: infidèl
Hungarian: megbízhatatlan (hu)
Icelandic: óáreiðanlegur (is) m
Irish: abhógach, ainfhéichiúnta, feillbhéasach, neamhchoinníollach, neamhiontaofa, neamh-mhuiníneach
Italian: inaffidabile (it) m
Macedonian: недо́верлив (nedóverliv), нена́дежен (nenádežen), неси́гурен (nesíguren)
Maori: kahurakiraki, māngina, hārakiraki, hurori, kōnukenuke, kahurangi (mi), māngina, mōngina, hārekereke
Norwegian:
Bokmål: upålitelig (no)
Nynorsk: upåliteleg
Plautdietsch: onbestendich
Polish: nierzetelny m, awaryjny (pl) (of a mechanical system)
Portuguese: não confiável, inconfiável
Russian: ненадёжный (ru) (nenadjóžnyj), неблагонадёжный (ru) (neblagonadjóžnyj)
Serbo-Croatian: nepouzdan (sh) m
Spanish: no fidedigno
Swedish: opålitlig (sv)
Tocharian B: empakwatte
Turkish: güvenilmez (tr)
Ukrainian: ненаді́йний (nenadíjnyj)