abide, bagatelle, belligerent, characterization, lachrymose, qualify, unflappable
Keira Knightley says that she can be an "awful" girlfriend who is "an emotional wreck" when she is in a belligerent mood. She does not understand how anyone could abide her behavior, as she becomes lachrymose when she gets angry. She qualifies her characterization of herself by explaining that she is unflappable in serious situations and it is only the bagatelles that cause her to unravel.
belligerent - (adjective) inclined to fight; waging war
abide - (verb) to put up with
lachrymose - (adjective) tearful
qualify - (verb) to limit or restrict; to describe the characteristics of; to make less harsh; to make eligible for a position
characterization - (noun) a description of qualities or features; the act of describing qualities or features
unflappable - (adjective) extremely calm; not easily upset
bagatelle - (noun) something insignificant or unimportant; a frivolity