Was heißt »mangelhaft« auf Englisch?

Das Adjektiv mangelhaft lässt sich wie folgt von Deutsch auf Englisch übersetzen:

Deutsch/Englische Beispielübersetzungen

In manchen ärmlichen Gebieten ist die Nahrungsmittelversorgung mangelhaft.: Nutrition is inadequate in some poor areas.
Statt es mangelhaft zu tun, kann man es auch gleich bleiben lassen.: You may as well not do it at all than do it imperfectly.
Ein Zyniker ist ein Schuft, dessen mangelhafte Wahrnehmung Dinge sieht, wie sie sind, statt wie sie sein sollten.: A cynic is a blackguard whose faulty vision sees things as they are, not as they ought to be.
Die gefährlichsten Kopfschmerzen werden durch mangelhaft verdaute Ideen verursacht.: The most dangerous headaches are caused by deficiently digested ideas.
Viele archäologische Stätten sind aufgrund mangelhafter Instandhaltung gefährdet.: Many archeological sites are at risk due to poor maintenance.; Many archaeological sites are at risk because of poor maintenance.

The car was recalled because of a faulty air bag.
The shelter offered us only insufficient protection from the storm.
Come straight up to the third floor, but please, not in that lift – it's faulty.
As I wrote above, the book arrived in defective condition.
My camera's display is defective.
A faulty washing machine has flooded the whole kitchen.
A faulty washing machine flooded the whole kitchen.
That is insufficient.
The discovery of inadequate infection control protocols in several dental clinics has given rise to fears that patients may have been infected with HIV or hepatitis.
My fridge is faulty.
The bell is faulty.
Many of my friends tried to live on their own but moved back home because of insufficient funds for their lifestyle.
Inadequate questions give rise to inadequate answers.
The thermostat is defective.
It's inadequate.
The clock is defective.
His knowledge of geography is insufficient.
The search function is inadequate.
There is a good number of problems for which the Karush-Kuhn-Tucker conditions are insufficient to guarantee optimality, but this doesn't change the fact that these conditions are an indispensable tool for doing optimization.
Don't read under insufficient light, for it is bad for your eyes.