The phrase "a certain and reliable" is correct and usable in written English.
It can be used when describing something that is both specific and trustworthy.
Example: "We need to find a certain and reliable source for our research to ensure the accuracy of our findings."
Alternatives: "a definite and trustworthy" or "a specific and dependable".
Pretending that the government's current forecasts and plans are certain and reliable, when the ones made only three years ago turned out to be anything but, stretches credulity.
These functional histories support human memory and provide the material for research, or the factual knowledge of nature, which must be certain and reliable.
The items for brand trust measure a consumer's belief that a certain brand is reliable and worthy of trust.
If perception is considered as a certain reliable way of being caused to have true beliefs about the environment by sensory stimulation, there is no need to suppose that these true beliefs have to be about an instantaneous state of the world.
Nevertheless, converging studies are pointing to certain consistent and reliable impacts of pornography use.
These groups meet a number of times so that they can say that their agreement about a certain diagnosis is reliable.
Owing to fragile connectivity in free traffic flow, the point-to-multipoint mode is used to guarantee a certain reliable transmission.
By combining label agreement [17] and label proportion similarity between the predicted and true labels, our reweighting strategy will not only weaken the role of unreliable samples in the training set T but also keep the important role of a certain number of reliable samples within the constraints of label proportions for the major class in each cell.
Your once certain, secure and reliable attachment bond is completely thrown into question, breaking all sense of a secure base.
