noun
under consideration; under review; pending
Used when a matter is being examined or discussed and a decision has not yet been reached. Common in business, administrative, and formal contexts.
その提案は現在検討中です。
The proposal is currently under consideration.
日程についてはまだ検討中で、来週には決まる予定です。
The schedule is still under review and is expected to be decided next week.
未定 simply means 'undecided', while 検討中 implies active examination is underway.
Compound of 検討 (kentō, 'examination, consideration') + 中 (chū, 'in the process of').