PC

*ˀmṣ - to be strong (Kogan 2015: 281)

Cf. perhaps (with DRS 23) Arb. ˀmḍ ‘to be strongly resolved’ It is also tempting to compare Akk. emēṣu ‘to be hungry’, assuming the meaning shift “strength” > “hardship, hunger” illustrated by Akk. dannatu ‘hunger’ < dannu ‘hard, strong’

Ugaritic
ˀamṣ - strong (DUL 74)
Hebrew
ˀmṣ - to be strong (HALOT 65)
Hebrew
ˀammīṣ - strong (HALOT 63)