The phrase "unwanted occurrence" is correct and usable in written English.
It is an expression used to describe something that happens unexpectedly and is undesired or unwelcome. For example: "The sudden drop in temperature was an unwanted occurrence for my outdoor event."
An adverse event (AE) is any unwanted medical occurrence in a patient or clinical investigation subject administered a pharmaceutical or medical product and which does not necessarily have a causal relationship with this treatment.
The combined effect of the research findings is that aircraft maintenance personnel are unable to consistently undertake accurate and timely fault diagnosis tasks and this results in unwanted NFF occurrences.
Biocides and pesticides are designed to control the occurrence of unwanted organisms.
Another water quality issue is the occurrence of unwanted microbes such as bacteria carrying antibiotic resistance genes [13, 14].
Careful consideration of individual risk factors should be given before prescribing to avoid cumulative risks and minimize the occurrence of unwanted events.
The higher order term ((propto phi _{alpha }phi _{beta }phi _{delta })) is an artificial construction which prevents the occurrence of unwanted third phases at binary interfaces in a multiphase system.
On the ICU adults of the AMC (Amsterdam, The Netherlands) the available registries used for error reporting did not give insight in the occurrence of unwanted events, and did not lead to preventive measures.
The main objective of this paper is to investigate the structural behaviour of commonly used composite floors subjected to rhythmic dynamical load actions identifying the occurrence of unwanted vibrations that could cause human discomfort or, in extreme cases, structural failure.
One common problem with chemical labelling is the occurrence of unwanted side reactions.
A drawback of an overexpression strategy could be the occurrence of unwanted pleiotropic effects, e.g. early flowering or a reduced number of flowers.
