孤 isolation

The isolated child sat in the corner eating watermelon.

solitude ★★☆☆☆
孤 (isolation) + 独 (solitary) = 孤独 (solitude)

loneliness, solitude

isolation ★☆☆☆☆
孤 (isolation) + 立 (stand up) = 孤立 (isolation)

orphan ☆☆☆☆☆
孤 (isolation) + 児 (baby) = 孤児 (orphan)