What is the opposite of reliable?

Need antonyms for reliable? Here's a list of opposite words from our thesaurus that you can use instead.

Adjective
(of a person) Opposite of able to be trusted due to having integrity or principles
“The witnesses were unreliable and were only looking to cash in on their fifteen minutes of fame.”
Adjective
(of ideas, opinion or advice) Opposite of able to be trusted due to being valid or well-founded
“Kieran has only had bad relationships, so why should I take any notice of his unsound opinions on love?”
Adjective
(of a product) Opposite of consistently good in quality or performance
“If you buy an imitation, you will likely be getting an undependable product.”
Adjective
(business) Opposite of suitable or fit to be relied on
“I cannot trust this company as they have consistently proven themselves to be rather inferior.”
Adjective
Opposite of being faithful and devoted in one's support
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“Edward now regarded the struggle as the suppression of a rebellion of disloyal subjects.”
Adjective
Opposite of of, characterized by, or consisting of (incontrovertible) facts
“The proposal submitted to the board was not accepted with a number of questionable recommendations to be interrogated.”
Adjective
Opposite of firm, strong, or substantial
“From years of decay, the columns holding the structure together appear to be fragile.”
Adjective
Opposite of bearing good value, worth or reliability
“I will tell you in good faith, Sir, that this is a worthless investment, and your money is better spent elsewhere.”
Adjective
Opposite of conclusive or definitive
“She has given us an extremely vague description of the perpetrator, therefore, we cannot press charges.”
Adjective
Opposite of exact in correspondence or adherence to something; not allowing or admitting deviation or relaxation
“For the kids, the rules can probably be adhered to in a loose manner.”
Adjective
(of a person) Opposite of free from emotional or mental agitation
“But that is as far as I can go in praising this decrepit and unbalanced person.”
Adjective
Opposite of having a good reputation
Adjective
Opposite of real and exactly what it appears to be
“We were surprised at the amount of fake merchandise available for sale.”
Adjective
Opposite of sensible and balanced in personality and emotional behavior
“For a grown woman, she sure acts like an immature and petulant child.”
Adjective
Opposite of upstanding, especially law-abiding
“Criminals are some of the most degenerate human beings on our planet.”
Adjective
Opposite of loyal, reliable, and hard-working
Adjective
Opposite of certain to happen
“Failure is avoidable if you take the necessary precautions.”
Adjective
Opposite of capable of withstanding great physical force
“The house was built on fragile foundations.”
Adjective
Opposite of competent or talented
“The amateur painter produces unrefined works of art that lack depth and finesse.”
Adjective
Opposite of worthy of or eliciting admiration
“It was a disgraceful act that brought the game into disrepute.”
Adjective
Opposite of possessing sound judgment
Adjective
Opposite of meeting standards for safe flight
Adjective
Opposite of completely honest and reliable
Adjective
Opposite of capable of being defended with good reasoning against verbal attack
Adjective
Opposite of characteristic of a particular person or thing
Adjective
Opposite of steadfast and constant
Adjective
Opposite of persisting for an extended period of time
Adjective
Opposite of denoting or relating to an action that takes place at a particular point in time
Adjective
Opposite of genuine
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