From Wiktionary, the free dictionary
From un- + reliable .
unreliable (comparative more unreliable , superlative most unreliable )
Not reliable .
Synonyms: flakey , sporadic , undependable
Antonym: 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 (sq)
Azerbaijani: etibarsız
Basque: ganoragabe , ganorabako
Belarusian: ненадзе́йны ( njenadzjéjny )
Bulgarian: ненадежден (bg) ( nenadežden )
Chinese:
Mandarin: 不可靠的
Czech: nespolehlivý (cs)
Danish: upålidelig
Dutch: onbetrouwbaar (nl)
Esperanto: nefidinda
Finnish: epäluotettava (fi)
French: non fiable , à qui on ne peut pas se fier
German: unzuverlässig (de)
Greek: αναξιόπιστος (el) ( anaxiópistos )
Haitian Creole: infidèl
Hungarian: megbízhatatlan (hu)
Icelandic: óáreiðanlegur (is)
Irish: abhógach , ainfhéichiúnta , feillbhéasach , neamhchoinníollach , neamhiontaofa , neamh-mhuiníneach
Italian: inaffidabile (it)
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 , awaryjny (pl) ( of a mechanical system )
Portuguese: não confiável , inconfiável
Russian: ненадёжный (ru) ( nenadjóžnyj ) , неблагонадёжный (ru) ( neblagonadjóžnyj )
Serbo-Croatian: nepouzdan (sh)
Spanish: no fidedigno , non fiable , poco confiable
Swedish: opålitlig (sv)
Tocharian B: empakwatte
Turkish: güvenilmez (tr)
Ukrainian: ненаді́йний ( nenadíjnyj )
Welsh: gwantan (cy) , annibynadwy (cy)