"In their opinion": possible Turkish translations
Merhaba! :)
I have a question about the Turkish rendition of "in their opinion".
Apart from "onlara göre", would it be possible to use "onlarca" as a synonym?
Sağ ol:)

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Makes perfect sense but I'd say, onlara göre is better.

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According to TDK (Türk Dil Kurumu) onlarca means;

1. sıfat Pek çok, çok sayıda olan:
      "Yüzlerce ilaç, onlarca yöntem hep bunu amaçlamıştı." - Elif Şafak
      (a great number of)

2. zarf (onla'rca) Onlara göre, onların düşüncesince.
    (in their opinions, according to them)

As an adverb "onlarca" means "onlara göre" but in the daily life we do not use  in this way:)

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Thanks a lot, Ayşenil :)

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If you exactly want to say it with "opinion", you can also say it like "onların fikrine göre".

"onlarca" is a bit colloquial :) And yes it also means "tens" / "tens of..." , too.