Unconnected and without a definite aim; haphazard.
1. Random thoughts often pop into my head at the most unexpected times. 2. I like to write down my random thoughts in a notebook to revisit later.
1. "I have a lot of random thoughts on any given day." Mindy Kaling, source: Twitter 2. "I have a lot of random thoughts that I don't share with anybody." Shia LaBeouf, source: Interview with Parade Magazine