When I encounter a new vocabulary word, it is often useful to see how that word is used in other contexts. Previously, I would use Jisho.org and do a sentence search for the word, but they really only have sentences from tatoeba.org, which are not always the most natural, and sometimes, there just aren't very many. I've found yourei.jp to be significantly better, as they take example sentences from real books and display them in order of readability.

Compare (example word: 円満)

• Jisho.org
• yourei.jp
• weblio.jp

One disadvantage is that yourei.jp doesn't provide English translations, so if you need those you might be better served elsewhere.

(For this particular example word I chose, weblio.jp seems to have decent results, but it overall seems to be hit-or-miss. For instance, ぼかす. Lots of sentences, but they're all basically useless. Most seem to be excerpts from technical manuals.)