Use 'erratically' to describe actions lacking a clear pattern or method, which can make someone seem confused or unreliable. He answered the questions erratically, confusing the interviewer.
Pro Tip 2/3
Negative Implication
'Erratically' often suggests a problem or something wrong, such as a fault in mechanics or someone's unpredictable behavior. The old clock ticks erratically, in need of repair.
Pro Tip 3/3
Reaction to Stimuli
Describe reflexes or instincts with 'erratically' when they produce inconsistent responses to stimuli or stress. The startled bird flew erratically from branch to branch.