arduus

Meaning

(adjective, declension-1, declension-2) lofty, high, steep, tall, elevated
(adjective, declension-1, declension-2) hard to reach, difficult, laborious, arduous

steep

labourious

proudly elevated

laboursome

tireful

labōriōsus

escarpat

Pronounced as (IPA)

[ˈar.du.ʊs]

From a Proto-Italic *arðwos, from Proto-Indo-European *h₃r̥dʰwós, from *h₃erdʰ- + *-wós (whence Latin -uus). Cognate with Latin arbor (“tree”), Welsh ardd (“high; hill”), Old Irish ard (“high; height”), Ancient Greek ὀρθός (orthós, “upright, straight”), Sanskrit ऊर्ध्व (ūrdhvá, “rising upwards, high”).