complejo

complex

adjective kohm-PLEH-hoh Less Common

Origin: from Latin complexus, meaning 'entwined'

Also means

complicated

Usage Note

Complejo can also be used as a masculine noun: un complejo deportivo (a sports complex) or un complejo de inferioridad (an inferiority complex). The adjective follows the noun in most cases: un problema complejo.

Examples

"Este problema es muy complejo."

Natural Translation

This problem is very complex.

Free starter pack

Building your Spanish vocabulary?

Get the 100 most common Spanish words as a free PDF — one email, no spam.

Related Words

Explore Spanish by topic

SpanishNow

Te Quiero vs Te Amo: Saying "I Love You" in Spanish

Te quiero vs te amo, explained: te quiero is the warm, safe everyday I love you; te amo is deeper and more romantic. A relationship-by-relationship map.

June 3, 2026 6 min read

SpanishNow

Spanish Numbers 1-100: Count, Spell & Pronounce

Spanish numbers 1 to 100 are a system, not a list: three patterns build every number. Master the spelling, the accent rule, and how to say prices fast.

June 9, 2026 6 min read

SpanishNow

Ser vs. Estar: When to Use Each in Spanish

Ser vs estar made simple: how you feel and where you are use estar, everything else uses ser. Master the rule, the exceptions, and the traps that flip meaning.

June 3, 2026 6 min read

SpanishNow

How to Say "You" in Spanish: Tú, Usted, Vos & Vosotros

Spanish has five words for "you": tú, usted, vos, vosotros, and ustedes. Learn which to use by who you're talking to and where — plus the verb endings.

June 3, 2026 6 min read