元気そうだ

looks well

→ 元気だ
phrase Rare #23,426
looks well Used to say that someone appears healthy, energetic, or well. そうだ here means “seems” or “looks,” based on observation. な at the end makes the statement casual and often expresses the speaker’s impression.
JA: 今日は元気そうだね。
EN: You look well today.

思ったより元気そうだ

You look healthier than I expected.

— バトル・ロワイアル (2000)

どう見ても彼女は元気そうだ

She looks perfectly healthy, no matter how you look at it.

ところで元気そうだ

By the way, you look well.

— 甘い生活 (1960)

あなた元気そうだ前より似合ってる

You look well, and your clothes suit you better than they used to.

— ハウルの動く城 (2004)

元気そうだ

Everyone looks well.

— ラブ・アクチュアリー (2003)

彼は元気そうだ

He looks well.

元気そうだ

You look well.

— ビッグ・シック ぼくたちの大いなる目ざめ (2017)

彼らはみんな元気そうだ

They all look well.

元気そうだ

You look well.

— ジョジョ・ラビット (2019)