“不充分地”常见英文表达有 inadequately、insufficiently 或 not sufficiently。具体使用哪个词，需根据语境和表达习惯来选择：
Inadequately：强调程度或数量上的不足，常用于描述资源、准备或应对措施等不够充分。例如：
The response to the emergency was inadequately planned.（对紧急情况的应对计划不充分。）
The evidence presented in court was inadequately convincing.（法庭上出示的证据不够有说服力。）
Insufficiently：同样表示数量或程度上的不足，但更侧重于强调“不够”或“未达到所需水平”。例如：
The budget for the project was insufficiently allocated.（项目预算分配不足。）
The training provided was insufficiently comprehensive.（提供的培训不够全面。）
Not sufficiently：是一个较为通用的表达方式，用于强调某事物在程度、数量或质量上未达到所需标准。例如：
The data collected was not sufficiently detailed.（收集的数据不够详细。）
His efforts were not sufficiently recognized.（他的努力没有得到足够的认可。）