wanting
Lacking something important or not good enough.
Wanting means lacking or missing something necessary or desired. When something is wanting, it's not up to standard or falls short of what's needed. If a book report is wanting in details, it doesn't include enough information. If a team's defense is wanting, it has weaknesses that need improvement.
The word often appears in phrases like “found wanting,” which means someone or something was tested and didn't measure up. If a bridge is found wanting during an inspection, engineers discovered it's not strong enough to be safe. When a student's effort is found wanting, their work shows they didn't try hard enough.
You'll also see wanting used to describe someone who lacks something important. A person wanting in courage doesn't have enough bravery. Someone wanting in common sense makes unwise decisions.
The word carries a sense of falling short or being inadequate. It's stronger than just “needs improvement.” When something is described as wanting, it means there's a real gap between what exists and what should be there. A soccer team wanting in speed doesn't just need to get a little faster: speed is genuinely missing from their game in a way that matters.