IPA: /ɪˈrætɪkli/
KK: /ɪˈrætɪkli/
In a way that is not regular or consistent; happening in an unpredictable manner.
The car drove erratically, swerving from side to side on the road.
Erratically → It is formed from 'erraticus' (from Latin, meaning wandering or straying) and the suffix '-ly' (meaning in a manner of). The word 'erratically' describes an action done in a wandering or unpredictable manner.
Think of 'wandering' ('erraticus') to remember that 'erratically' means doing something in an unpredictable or inconsistent way.