na-adjective
Describes something that yields results, output, or value, often in work, economy, or activity.
今日はとても生産的な一日だった。
Today was a very productive day.
会議を生産的にするために、事前に資
Please read the materials beforehand to make the meeting productive.
na-adjective
Emphasizes positive contribution, usefulness, or purposefulness, often in discussions, criticism, or activities.
彼の意見はいつも生産的だ。
His opinions are always constructive.
ただ文句を言うだけでは生産的ではない。
Just complaining is not constructive.
建設的 is closer to 'constructive' in the sense of building up ideas or solutions, often used for criticism or discussion. 生産的 can also mean 'constructive' but leans more toward tangible productivity.
生産 (production) + 的 (-like, -ive). A straightforward Sino-Japanese compound.