A deficiency in the amount, competence or presence of something.
Season 4, Episode 7 - The Apology Insufficiency
Aired November 4, 2010
Howard is working on a new Department of Defense project and needs top-level security clearance. His friends are interviewed by the F.B.I. and each of them has reason to think their interview might have jeoparized Howard's job prospects.
Season 7, Episode 1 - The Hofstadter Insufficiency
Aired September 26, 2013
With Leonard still away at sea, Sheldon and Penny bond by sharing some intimate secrets. Meanwhile, still recovering from his break-up from Lucy, Raj tries to get back on the dating scence. Elsewhere, Amy and Bernadette attend a biology convention together.
Season 8, Episode 3 - The First Pitch Insufficiency
Aired September 29, 2014
When Wolowitz is asked by NASA to throw the first pitch at a Los Angeles Angels Game, he worries about embarrassing himself in front of a huge crowd. Meanwhile, when Sheldon claims that he and Amy are the "superior couple" to Leonard and Penny, they set out to prove him wrong.
Season 9, Episode 6 - The Helium Insufficiency
Aired October 26, 2015
In the midst of a nation-wide helium shortage, Sheldon and Leonard take desperate measures to get the supplies they need. Also, Penny and Bernadette download a dating app on Amy's phone to try and find her a new man.
Season 11, Episode 22 - The Monetary Insufficiency
Airs April 26, 2018
Sheldon goes to Vegas to win money for science. Also, Penny and Bernadette take Amy wedding dress shopping, but her terrible choice entangles them in a web of lies.