Klein Dictionary, אמץ ᴵ

אמץ ᴵ to be strong.
    — Qal - אָמַץ was strong, was bold.
    — Pi. - אִמֵּץ he strengthened, encouraged.
    — Pu. - אֻמַּץ 1 was performed with difficulty. 2 was adopted (said of a child).
    — Hith. - הִתְאַמֵּץ he strengthened himself; he made an effort, endeavored, determined.
    — Hiph. - הֶאֱמִיץ was strong, became strong. [Ugar. a̧mṣ (= strong).] Derivatives: אֹמֶץ, אַמֽצָה, אִמּוּץ, אַמִּיץ, הַאֲמָצָה, הִתְאַמּֽצוּת, מַאֲמָץ, מְאֻמָּץ. cp. אָמֹץ.