Brickbat

murikka

(piece of brick, rock, etc., especially when used as a weapon)

risu

(piece of (sharp) criticism or a (highly) uncomplimentary remark)

arvostella kärkevästi

(to assail (someone or something) with (sharp) criticism)

heittää kiviä

(to attack (someone or something) by swinging or throwing brickbats)