当時はまだ彼はたくましい精神力だった。

当時はまだ彼はたくましい精神力だった。

In those days, he was still strong and energetic.

当時(とうじ)はまだ彼(かれ)はたくましい精神力(せいしんりょく)だった。

Tōji wa mada kare wa takumashii seishinryoku datta.

当時 (とうじ)

at that time; in those days

は (は)

topic marker particle; indicates contrast with another option (stated or unstated); adds emphasis

未だ (まだ、いまだ)

as yet; hitherto; only; still; not yet (with negative verb); more; besides; unfinished; incomplete; not yet finished with

彼 (かれ)

he; him; his; boyfriend

逞しい (たくましい)

burly; strong; sturdy; indomitable; indefatigable; strong-willed; resolute; bold; robust (vitality, appetite, economic growth, etc.); strong

精神力 (せいしんりょく)

emotional strength; force of will

だ (だ)

be; is; indicates past or completed action; indicates light imperative

Readings: トウ、あ.たる、あ.たり、あ.てる、あ.て、まさ.に、まさ.にべし

Meanings: hit, right, appropriate, himself

Readings: ジ、とき、 -どき

Meanings: time, hour

Readings: ヒ、かれ、かの、か.の

Meanings: he, that, the

Readings: セイ、ショウ、シヤウ

Meanings: refined, ghost, fairy, energy, vitality, semen, excellence, purity, skill

Readings: シン、ジン、かみ、かん-、こう-

Meanings: gods, mind, soul

Readings: リョク、リキ、リイ、ちから

Meanings: power, strength, strong, strain, bear up, exert