"act of frustrating," 1550s, from Latin frustrationem (nominative frustratio) "a deception, a disappointment," noun of action from past-participle stem of frustrari (see frustrate). Earlier (mid-15c.) with a now-obsolete sense of "nullification."
her constant complaints were the main source of his frustration
frumious
frump
frumpy
frustrate
frustrated
frustration
frustum
fry
fryer
frying-pan
fubar