Denshi Jisho — Online Japanese dictionary

重い おもい 1: heavy; weighty; massive;
2: heavy (feeling); depressed; gloomy; blue; uneasy;
3: slow; sluggish; lumbering; ponderous; clumsy;
4: important; serious; grave;
5: serious; severe; critical;
6: solid; established; dignified; sensible
Common word, Adjective 
重い罪 おもいつみ serious (grave) crime
Noun 
重い任務 おもいにんむ important task
Noun 
重い故障 おもいこしょう hard failure
Noun, Computer terminology 

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