楽しそうだ

looks fun

→ 楽しい
phrase Common #5,660
looks fun Describes something that appears enjoyable or someone who seems to be having fun. The example sentences 2 and 3 use 楽しかった, which means “was fun” or “had fun,” not 楽しそうだ.
JA: そのパーティーは楽しそうだね。
EN: That party looks fun.

みんな楽しそうだ

Everyone looks like they're having fun.

— 七人の侍 (1954)

ハハ楽しそうだ君たちいくつなの

Haha... You guys look like you're having fun. How old are you?

— 天気の子 (2019)

楽しそうだ

That looks fun.

— アバウト・タイム ~愛おしい時間について~ (2013)

毎朝とても楽しそうだけど

You seem to be having a lot of fun every morning, though.

いやひどく楽しそうだいやこれは生まれつき

Well, you look awfully happy. No, I was born this way.

— 七人の侍 (1954)

彼はと一緒ときが一番楽しそうだ

He seems happiest when he's with his grandchildren.

今日は随分と楽しそうだ

You seem to be having a lot of fun today.

彼はとても楽しそうだ

He looks like he’s having a great time.

ピクニックみたいで楽しそうだ

It looks like a picnic—sounds like fun.

— レベッカ (1940)

ジェーン楽しそうだ

Jane looks like she's having fun.