YOU SAID:
Weather is a boring subject
INTO JAPANESE
天気は話題として退屈です
BACK INTO ENGLISH
Weather is dull as the topic
INTO JAPANESE
天気は話題として鈍い
BACK INTO ENGLISH
The weather was dull as the topic
INTO JAPANESE
天気は話題として退屈だった
BACK INTO ENGLISH
The weather was dull as the topic
You should move to Japan!