迅速 and 拙速: prompt action and a hasty, poor result
Compare prompt handling with haste criticized for poor handling, reading speed together with the quality being assessed.
Prompt handling with 迅速
迅速 (じんそく) refers to prompt handling. The example 「係員の迅速な対応で混雑が解消しました。」 is translated as “The staff's swift response cleared the congestion.” The staff's prompt response results in the congestion being cleared.
The example 「質問にはできるだけ迅速に返事をします。」 is translated as “I respond to questions as promptly as possible.” The sentence describes answering questions as promptly as possible. 返事をします does not report an answer already completed here.
Haste and poor handling with 拙速
拙速 (せっそく) refers to hasty and inadequate handling. The example 「拙速な判断を避けるため、結論を翌日に持ち越した。」 is translated as “We postponed the conclusion until the next day to avoid a hasty decision.” The conclusion is postponed until the next day to avoid a hasty decision. The sentence does not report that a poor decision has already been made.
The example 「計画を拙速に進めれば、見落としが増える。」 is translated as “Rushing through a plan in a slapdash way leads to more oversights.” 計画を拙速に進めれば is a condition: slapdash progress leads to more oversights. It does not report that this plan has already been rushed or that oversights have occurred.
Speed alone does not establish the assessment
迅速 focuses on the prompt response that clears congestion or the prompt way of answering questions. 拙速 assesses the inadequacy of rushed handling, rather than another degree on the same speed scale.
Postponing the conclusion is tied to avoiding a hasty decision. Read the handling and its assessment without treating every fast response as poor or every slow response as accurate.
What differs between the 迅速な対応 that clears congestion and postponing a conclusion to avoid 拙速な判断?
Show the answer and why
The first reports a prompt response and cleared congestion. The second reports postponement for the purpose of avoiding a hasty, inadequate judgment. Speed and handling quality are different axes, so quick action alone does not establish poor handling.