臆おく断だん

noun, noun or participle which takes 'suru', transitive verb

hasty conclusion; conjecture; jumping to conclusions

Refers to forming a judgment based on insufficient evidence or speculation, often with a negative connotation of being rash or unfounded. Used as a noun or with する.

• 彼かれの意い見けんは単たんなる臆おく断だんに過すぎない。

  His opinion is nothing more than a hasty conclusion.

• 証しょう拠こもないのに臆おく断だんするのは危き険けんだ。

  It's dangerous to jump to conclusions without evidence.