1. not enough in quantity, quality, or ability for a particular purpose
2. not having the skills or qualities necessary for a particular task or role

Examples

• The funding for the project was inadequate to cover all expenses.
• Her preparation for the exam proved inadequate.
• The hospital has inadequate staff to handle the emergency.
• He felt inadequate for the demanding job requirements.
• The safety measures were inadequate to prevent accidents.
• The small umbrella was inadequate protection from the heavy rain.
• Many students receive inadequate nutrition at home.