na-adjective, noun
willful; selfish; self-centered
Describes a person who acts according to their own desires without considering others, often with a negative connotation.
彼は気ままな性格で、周りの迷惑を考えない。
He has a selfish personality and doesn't consider the trouble he causes others.
気ままに振る舞うと、友達を失うよ。
If you act willfully, you'll lose your friends.
na-adjective, noun
carefree; free-spirited; do-as-you-please
Describes a lifestyle or attitude of doing what one likes without being bound by rules or others' expectations; can be positive or neutral.
退職後は気ままな一人旅を楽しんでいる。
After retirement, I'm enjoying carefree solo travel.
彼女は気ままに絵を描いて暮らしている。
She lives a free-spirited life, painting as she pleases.