How do you say strong in Japanese?

It all depends on what type strong you are talking about:

Having Strength: tsuyoi (robust) joobuna (intense) hageshii (of will, unwavering) kyookona (support) kyooryokuna

Proficient: (be strong in) joozu tokui da, ... nitsuyoi

Of Argument: (conviencing) settokuryoku no aro (legitimate) mottomona

Of Opinion: (definite, clear) hakkirishita

Of Possibility: takai

Of drink: tsuyoi

Of Currency: tsuyoi

** i may be spacing the Words incorrectly, when translating them over to English from Hiragana it is hard to tell where the spaces go because I am reading directly from my dictionary and in Hirigana alltheWordsareputtogethersoitishardtoread . :]**