An enemy without cause / baseless enemy
A person who hates another without a justified reason.
("Like a bird, my enemies pursue me without cause." – Lamentations 3:52)
Translation
Expression (Hebrew)
אוֹיֵב חִנָּם
Definition (Hebrew)
אָדָם הַשּׂוֹנֵא אַחֵר לְלֹא סִבָּה מֻצְדֶּקֶת.
("צוֹד צָדוּנִי כַּצִּפּוֹר אֹיְבַי חִנָּם" - איכה ג נֹב)