Vago vs. impreciso vs. nebuloso vs. indefinito
The Italian words vago, impreciso, nebuloso, and indefinito all describe something unclear, but they focus on different aspects of unclarity. While vago relates to a general lack of detail or an evasive attitude, impreciso points to a specific lack of exactness or mathematical accuracy. On the other hand, nebuloso implies that something is confusing or obscured, like a thick fog, and indefinito describes something that lacks clear boundaries, shapes, or set limits.
Vago
The word vago is used when something lacks specific details, clarity, or is intentionally evasive. It is often applied to memories, feelings, promises, or answers where the information provided is scarce or non-committal.
Ho solo un ricordo vago di quella giornata estiva.
(I only have a vague memory of that summer day.)
Il direttore ha dato una risposta vaga alle nostre domande.
(The manager gave a vague answer to our questions.)
Provo un vago senso di colpa per quello che è successo ieri.
(I feel a vague sense of guilt about what happened yesterday.)
Non essere così vago, dimmi esattamente cosa vuoi mangiare.
(Do not be so vague, tell me exactly what you want to eat.)
Mi ha fatto una promessa vaga riguardo al mio aumento di stipendio.
(He made me a vague promise regarding my salary raise.)
Impreciso
You should use impreciso to describe something that lacks accuracy, correctness, or exactness. Unlike vago, which implies missing information, impreciso indicates a measurable flaw or error in data, measurements, calculations, descriptions, or physical actions.
Il tuo calcolo è impreciso e deve essere rifatto da capo.
(Your calculation is inaccurate and needs to be redone from scratch.)
Il testimone ha fornito un resoconto impreciso della dinamica dell'incidente.
(The witness provided an imprecise account of the accident's dynamics.)
Questo vecchio orologio è sempre impreciso di qualche minuto.
(This old clock is always inaccurate by a few minutes.)
Il suo tiro verso la porta è stato impreciso e la palla è finita fuori.
(His shot at the goal was imprecise and the ball went out.)
Le istruzioni di montaggio che ci hanno mandato erano molto imprecise.
(The assembly instructions they sent us were very inaccurate.)
Nebuloso
The adjective nebuloso literally translates to cloudy or foggy, and it is used metaphorically to describe concepts, explanations, or situations that are highly confusing, obscure, or hard to mentally grasp. It suggests a lack of transparency that prevents a clear understanding of the full picture.
Il professore ha spiegato un concetto filosofico molto nebuloso.
(The professor explained a very nebulous philosophical concept.)
Il futuro dell'azienda rimane nebuloso dopo le dimissioni del presidente.
(The future of the company remains obscure after the president's resignation.)
La trama di questo romanzo poliziesco è troppo nebulosa per i miei gusti.
(The plot of this detective novel is too confusing for my taste.)
Ho in mente un piano di investimenti ancora un po' nebuloso che devo sviluppare.
(I have a still somewhat cloudy investment plan in mind that I need to develop.)
La situazione politica attuale nel paese è piuttosto nebulosa.
(The current political situation in the country is quite confusing.)
Indefinito
The word indefinito describes something that has no established limits, clear boundaries, or distinct shape. It is commonly used when talking about time periods, physical outlines, abstract spaces, or things that simply have not yet been strictly decided or categorized.
Il progetto di costruzione è stato sospeso per un tempo indefinito.
(The construction project has been suspended for an indefinite time.)
In lontananza ho visto una sagoma indefinita avvicinarsi nella nebbia.
(In the distance I saw an undefined shape approaching in the fog.)
Provo un sentimento indefinito di malinconia che non riesco a spiegare a parole.
(I feel an undefined feeling of melancholy that I cannot explain in words.)
Il colore di quella parete è un grigio azzurro abbastanza indefinito.
(The color of that wall is a rather undefined blue-gray.)
Abbiamo lasciato il budget della campagna di marketing indefinito.
(We left the budget of the marketing campaign undefined.)
Summary
To choose the right word, remember their core nuances: use vago for a general lack of detail or an evasive answer, impreciso when something lacks strict accuracy or correctness, nebuloso for ideas and situations that are abstractly confusing or obscured, and indefinito for anything lacking clear boundaries, shapes, or established limits.