costly
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costly
Causes high costs; is very expensive. The term often emphasizes that the price is perceived as high or even excessive.
Die Renovierung des alten Schlosses war eine äußerst kostspielige Angelegenheit.
The renovation of the old castle was an extremely costly undertaking.
The word is made up of 'Kosten' (costs) and the ending '-spielig.' So it literally describes a matter that 'plays with a lot of costs' or brings high costs with it.
Ein eigenes Auto kann eine kostspielige Sache sein.
Having your own car can be a costly thing.
'Kostspielig' (costly) belongs to a more elevated style of language than the word 'teuer' (expensive). It often emphasizes that the costs are unexpectedly high or represent a major financial burden.
Der Rechtsstreit entwickelte sich zu einem langen und kostspieligen Verfahren.
The legal dispute developed into a long and costly proceeding.
'Kostspielig' (costly) is often used for projects, hobbies, or unforeseen events. Typical combinations are 'ein kostspieliges Hobby' (a costly hobby), 'eine kostspielige Reparatur' (a costly repair), or 'ein kostspieliger Fehler' (a costly mistake).
Segeln gilt als ein ziemlich kostspieliges Hobby.
Sailing is considered a fairly costly hobby.
expensive
'teuer' and 'kostspielig' both mean that something costs a lot of money. In many situations, you can use both words in a similar way. 'teuer' is the normal everyday word and fits almost anything, for example clothing, rent, or food. 'kostspielig' sounds a little more formal and often emphasizes that something causes high costs, for example a repair, a trip, or a project. In everyday language, people say 'teuer' more often; if you want to emphasize the high overall costs, 'kostspielig' fits very well.
Die Reparatur des Autos wird im Urlaub wahrscheinlich kostspielig.
The car repair will probably be costly during the vacation.
Luisa kauft das Handy nicht, weil es zu teuer ist.
Luisa is not buying the phone because it is too expensive.