omega male

(名詞) 人微言輕的男人:在社交或專業場合中最不可能擔任主導角色的男人。

American pop culture keeps producing endless variations on the omega male, who ranks even below the beta in the wolf pack. This often-unemployed, romantically challenged loser can show up as a perpetual adolescent (in Judd Apatow's Knocked Up or The 40-Year-Old Virgin), or a charmless misanthrope (in Noah Baumbach's Greenberg), or a happy couch potato (in a Bud Light commercial). He can be sweet, bitter, nostalgic, or cynical, but he cannot figure out how to be a man.
—Hanna Rosin, "The End of Men," The Atlantic, June 8, 2010

These "omega male" partners of "breadwinner wives" are exactly the people who are transforming the gender dynamics of family and spurring a revolution in engaged fatherhood. In fact, the much-maligned qualities that qualify men as "omega males" — an apparent absence of testosterone, a childlike affinity for fun, a surplus of disposable time — are exactly the qualities that can transform men into remarkable fathers.
—Christopher Shulgan, "The daddy shift: How 'slackers' can make pretty good fathers," The Globe and mail, June 17, 2011