YOU SAID:

I didn’t reply because you were not doing well

INTO JAPANESE

調子が悪かったので返事しなかった

BACK INTO ENGLISH

I didn't reply because I wasn't feeling well

INTO JAPANESE

体調が悪かったので返事しなかった

BACK INTO ENGLISH

I didn't reply because I was ill

INTO JAPANESE

病気だったので返事しなかった

BACK INTO ENGLISH

I didn't reply because I was sick

INTO JAPANESE

病気だったので返事しなかった

BACK INTO ENGLISH

I didn't reply because I was sick