YOU SAID:
Gabi is bad at not telling the truth
INTO JAPANESE
ガビは真実を言わないのが苦手
BACK INTO ENGLISH
Gabi is not good at telling the truth
INTO JAPANESE
ガビは真実を言うのが苦手
BACK INTO ENGLISH
Gabi is not good at telling the truth
That didn't even make that much sense in English.