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I-adjective (keiyoushi)
Antonym: 軽い, 1
heavy, weighty, massivelourd

heavy (feeling), depressed, gloomy, blue, uneasygrave, important, sérieux
slow, sluggish, lumbering, ponderous, clumsy
of a position, responsibility, etc.
important, serious, grave

of a punishment, illness, etc.
serious, severe, critical

solid, established, dignified, sensibleтяжёлыйschwer, schwerwiegend, ernst, ernsthaft, bedeutend, bedeutsam, wichtig, seriös, niedergeschlagen, niedergedrückt, bedrückt, deprimiert, entmutigt
ON: ジュウ, チョウKUN: え, おも.い, おも.り, おも.なう, かさ.ねる, かさ.なる, おも
heavy, heap up, pile up, nest of boxes, -fold

Conjugated forms
Example sentences
体積が大きいからといって常に重量も重いとは限らない。Parts: 体積 (たいせき), 大きい (おおきい), からと言って (からといって), 常に (つねに), 重量 (じゅうりょう), 重い (おもい), とは限らない (とはかぎらない)Great bulk does not always mean great weight.

「彼の病気は重いのかな」「そうでないといいね」Parts: (かれ), 病気 (びょうき), 重い (おもい), そうでない, 良い (よい)"Est-il sérieusement malade ?" "J'espère que non."
"Is he seriously ill?" "I hope not."

Community comments
The words and kanji on this web site come from the amazing dictionary files JMDict, EDICT and KANJIDIC. These files are the property of the Electronic Dictionary Research and Development Group, and are used in conformance with the Group's licence. The example sentences come from the projects Tatoeba and Tanaka Corpus. Kanji search by radicals is based on the Kradfile2 and Kradfile-u files containing radical decomposition of 13108 Japanese characters. Many thanks to all the people involved in those projects!