adj. 25B6; adjective RELIABLE, dependable, honest, honourable, upright, principled, true, truthful, as good as one's word, ethical, virtuous, incorruptible, unimpeachable, above suspicion; responsible, sensible, level-headed; loyal, faithful, staunch, steadfast, trusty; safe, sound, reputable; informal on the level; N. Amer. informal straight-up.
unreliable.