Part of speech:
Marked by a lack of responsibility:
Tending to deceive; apt to lie or cheat
Acting or done in a deceptive, secret, or sly manner; dishonest and sneaky.
Deceiving or intended to deceive
Having the ring of truth or plausibility but actually fallacious:
Alluring by false, showy charms; attractive in a flashy way; tawdry
Uttering falsehood; dishonest or deceitful.
Given to or characterized by trickery; deceitful
(Informal) Having or showing a tricky or deceitful nature; evasive
Not faithful or loyal
Changeable or unstable in affection, interest, loyalty, etc.; capricious
Tending or likely to be erroneous:
Lacking in vigour or expression.
Tending to delude.
Persuasive or ingratiating, especially in an effort to deceive.
In horse management an unsound horse is one suffering ill-health that affects its suitability for its intended work.
Containing or based on error; mistaken; wrong
Deep-toned, dull, and muffled, as though resounding from something hollow
Reputed or alleged
Not genuine; fake:
That will do for a while as a substitute
Disposed to lie, cheat, defraud, or deceive.
Determined or founded on individual discretion, especially when based on one’s opinion, judgment, or prejudice, rather than on fixed rules, procedures, or law. See also abuse of discretion.
Being such that alteration is possible:
Not reputable; having or causing a bad reputation; discreditable
(Geol.) Designating a boulder or rock formation transported some distance from its original source, as by a glacier
Characterized by irregular or intermittent activity, impulses, etc.; spasmodic; restless
Easily excited, upset, etc.
Unreliable or unscrupulous, especially with regard to business dealings:
The definition of haphazard is something disorganized or without any particular order to it.
Having qualities attributed to the god Mercury or supposedly influenced by the planet Mercury; eloquent, clever, shrewd, thievish, etc.
That can or should be questioned or doubted; open to doubt
Of or like mercury
(Statistics) Of statistical sample selection in which all possible samples have equal probability of selection
Not substantial; slight; flimsy
Subject to change; variable:
Beyond prudence or reason; excessive:
Lacking principles or moral scruples; unscrupulous:
Appropriate to or characteristic of a villain:
Tending to violence; explosive:
Playful or fanciful, especially in a humorous way:
The definition of reliable is dependable or capable of being trusted.
The definition of responsible is being the person thing that caused something to happen.
Worthy of trust; dependable; reliable
Persuasive, effective, and cogent:
The definition of furtive is doing something in a sneaky or hidden way.
Weak, defective, or liable to fail:
Find another word for unreliable. In this page you can discover 81 synonyms, antonyms, idiomatic expressions, and related words for unreliable, like: irresponsible, undependable, feckless, deceitful, capricious, underhanded, deceptive, specious, meretricious, false and giddy.