Quick answer
Diafano is delicate and literary. Translucido is the neutral technical word.
A reliable test is to identify the job of the word before translating from English.
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What each word does
diafano
diaphanous
Use diafano for very light, delicate, and see-through, often in literary description.
translucido
translucent
Use translucido for letting light pass through without being fully transparent.
How to choose
- diafano: Choose diafano if the sentence points to very light, delicate, and see-through, often in literary description.
- translucido: Choose translucido if the sentence points to letting light pass through without being fully transparent.
Examples
O tecido diafano cobria a janela.
The diaphanous fabric covered the window.
O vidro translucido dava privacidade.
The translucent glass gave privacy.
Common trap
Use translucido for materials and clarity; diafano adds a poetic tone.
Practice it in context
Pick one sentence from your real life and write it twice: once with diafano, then once with translucido. If both versions feel possible, name the meaning shift.
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