arduo

Learned borrowing from Latin arduus.

• IPA^(key): /ˈaɾdwo/ [ˈaɾ.ð̞wʊ]
• Rhymes: -aɾdwo
• Hyphenation: ar‧duo

arduo (feminine ardua, masculine plural arduos, feminine plural arduas)

1. arduous

   Synonyms: ardego, agre, carizolo

2. difficult (of a problem)
3. steep (of a slope)

• arduamente

Borrowed from Latin arduus.

• IPA^(key): /ˈar.du.o/, /ˈar.dwo/^[1]
• Rhymes: -arduo, -ardwo
• Hyphenation: àr‧du‧o, àr‧duo

arduo (feminine ardua, masculine plural ardui, feminine plural ardue)

1. arduous
2. difficult (of a problem)
3. steep (of a slope)

• arduamente

• arduità

• arduo in Treccani.it – Vocabolario Treccani on line, Istituto dell'Enciclopedia Italiana

arduō

1. dative/ablative masculine/neuter singular of arduus

Borrowed from Latin arduus.

• IPA^(key): /ˈaɾdwo/ [ˈaɾ.ð̞wo]
• Rhymes: -aɾdwo
• Syllabification: ar‧duo

arduo (feminine ardua, masculine plural arduos, feminine plural arduas)

1. very difficult

   Synonym: difícil

2. arduous

   Synonym: trabajoso

• “arduo”, in Diccionario de la lengua española [Dictionary of the Spanish Language] (in Spanish), online version 23.8.1, Royal Spanish Academy [Spanish: Real Academia Española], 15 December 2025