Flustrate (and its often said derivative
flustrated) is
not a word. It seems to be combined from the words
fluster and
frustrate.
Fluster means to agitate or confuse someone and
frustrate means to prevent something from happening or to cause someone to feel upset.
- Example: You need to complete the work on time without getting flustered.
- Example: This Spanish test is going to frustrate me to no end.
Memorization tip: Never, under any circumstances, use
flustrate or
flustrated.