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Erratically
Unsteady Patterns
Use 'erratically' to describe actions lacking a clear pattern or method, which can make someone seem confused or unreliable. 
Negative Implication
'Erratically' often suggests a problem or something wrong, such as a fault in mechanics or someone's unpredictable behavior. 
Reaction to Stimuli
Describe reflexes or instincts with 'erratically' when they produce inconsistent responses to stimuli or stress. 