[junar]

Sure, the ideal end state is that you know the Japanese word intuitively without English or another language as an intermediate step. But starting from a totally unfamiliar word, dictionary definitions and example sentences are both fast to access and easy to copy down. (For a sufficiently advanced learner, I would encourage using Japanese language dictionaries instead of Japanese-English ones.)

And I'm only recommending flash cards and other rote tools for kana, because recalling them instantly is both important and relatively low-effort. I don't have a strong opinion on how to learn vocabulary, other than to prioritize based on actual usage: media you read/listen to, conversations, etc.