On good/friendly terms; getting along well (adverb describing harmonious relations or actions done amicably).
子どもたちは仲良く遊んでいる。
The children are playing happily together.
隣人とは仲良くしておいたほうが何かと安心だ。
It's better to stay on good terms with your neighbors; it's convenient and reassuring.
二人は仲良く別々の意見を尊重した。
The two respectfully accepted each other's differing opinions in a friendly manner.
仕事でもプライベートでも、仲良く協力することが大切だ。
It's important to cooperate amicably both at work and in private life.