Anxiety is a conscious process, the primary negative emotion. DOI: 10.1126/science.aaa3245
Anxiety is the sensation we experience when we imagine or predict an unwanted future.
It is reasonable to conclude all other negative emotions are adjectives describing a particular quality of the unwanted future.
Stress, for instance is an unwanted future outcome of a specific event, eg. exam failure
Sad - loss
Anger - imagined threat, unfair attack.
Shame - caught doing something wrong
Depression - helpless to change a hopeless future