unreliable
1 disreputable, irresponsible, not conscientious, treacherous, undependable, unstable, untrustworthy
2 deceptive, delusive, erroneous, fake, fallible, false, implausible, inaccurate, mistaken, specious, uncertain, unconvincing, unsound
Antonyms
1 conscientious, dependable, regular, reliable, responsible, stable, trustworthy