deficient
This word is most commonly used in formal or professional contexts, such as medical reports, legal documents, or technical evaluations. When describing a lack of something specific (like vitamins), it is often paired with the name of that substance (e.g., 'iron-deficient'). In general conversation, people often use simpler words like 'lacking' or 'not enough', but 'deficient' is used when you want to emphasize that a standard has not been met.
💬Casual Conversation
🎬Tuesday afternoon, Chloe is at the campus health clinic waiting for results.
Chloe Smith
Doc says I'm iron deficient. No wonder I've been crashing lately.
Ryan
Damn that's crazy. Just eat some spinach lol.
💡
Chloe uses 'crashing' as slang for feeling sudden, extreme exhaustion. Ryan's response reflects his oblivious personality by dismissing a medical diagnosis with a cliché suggestion and a low-effort phrase ('damn that's crazy').