insufficient
US /ˌɪn.səˈfɪʃ.ənt/
UK /ˌɪn.səˈfɪʃ.ənt/

1.
onvoldoende, ontoereikend
not enough; inadequate
:
•
There was insufficient evidence to convict him.
Er was onvoldoende bewijs om hem te veroordelen.
•
The food supply was insufficient for the growing population.
De voedselvoorraad was onvoldoende voor de groeiende bevolking.