ADJ. major, serious, severe | slight, small | dietary, nutritional | enzyme, hormone, mineral, nutrient, vitamin | calcium, iron, etc.
VERB + DEFICIENCY have, suffer from suffering from a severe vitamin deficiency | correct, make good, make up, overcome, remedy I've been prescribed iron tablets to make up the deficiency. An engineer could remedy the deficiencies in the design.
PREP. ~ in serious deficiencies in the health service