1. petty; trivial; inconsequential: to quibble about a niggling difference in terminology.
2. demanding too much care, attention, time, etc.: niggling chores about the house.
"suspicions can be niggling at backs."
"injuries can be niggling."
"doubts can be niggling."
"problems can be niggling."
"points can be niggling."
This list can help you learn new vocabulary more quickly and be able explore other words more easily.