ad rem〈ラテン語〉 【形】on-target // pertinent // to-the-point
実に的を射たことを言う say things just like that <--- Nonsense
pithy advice
relevant remark // sharpshooting
mouthful ???????? // pertinent remark // remark which hits home // telling remark
question that hits the mark // well-directed question
classic reply
hit the [a] bull's-eye / score a bulls-eye
Everything he had said struck true.
You really said a mouthful when you told the boss our computers were out of date.
His rejoinder to the verbal attack was pointed and effective.
Your comment was right to the point.
be right on target // have a point