1. The annoying difference of others.
2. A person whose inherent personal characteristics, background or behavior is irritating or unpleasant.
3. The struggle to resist treating others less favorably because of their race, sex, sexual orientation, age or other inherent personal characteristic.
Sharing a lift full of Indian students after lunch on a hot Summers day is a fucking diversity challenge!
"Bossy? Doesn't listen? Sounds like your new boss Shoshana Steinberg is gonna be a diversity challenge!"
"She's on parental leave again. Unless you take on her work this organization won't meet its Diversity Challenge."