ブラウザの設定でJava Scriptの使用を有効にしてご利用ください。
出典:Wiktionary
From full + hearted.
full-hearted (comparative more full-hearted, superlative most full-hearted)
full + hearted
fullhearted (comparative more fullhearted, superlative most fullhearted)
Not to be confused with foolhardy.
full-hearted