YOU SAID:
I am an underweight wimp.
INTO JAPANESE
私は体重不足のウィンパーです。
BACK INTO ENGLISH
I am a weight deficient wimper.
INTO JAPANESE
私は体重が不足しています。
BACK INTO ENGLISH
I am short of weight.
INTO JAPANESE
私は体重が足りない。
BACK INTO ENGLISH
I am short of weight.
You've done this before, haven't you.