Here are some possible approaches, keeping in mind these are approximations and the best choice would depend on context:
Scottish Gaelic:
* Ceannard sgoinneil: This translates literally to "wonderful/marvelous leader." "Ceannard" means leader or boss, and "sgoinneil" means wonderful or marvelous. This is a fairly formal option.
* Boss math: This is a simpler, more informal option, meaning "good boss." You could add an intensifier like "ro-mhath" (very good) for emphasis.
* Ceannard air leth: This translates to "excellent/outstanding leader." "Air leth" means outstanding or exceptional.
Irish Gaelic:
* Ceannasaí den scoth: This translates to "excellent/top-notch leader." "Ceannasaí" means leader or boss, and "den scoth" means excellent or top-notch. This is a formal option.
* Boss maith: Similar to the Scottish Gaelic, this is a simpler, informal option meaning "good boss." Adding "an-mhaith" (very good) would strengthen the praise.
* Ceannasaí iontach: This translates to "fantastic/wonderful leader." "Iontach" means fantastic or wonderful.
Important Considerations:
* Formality: The choice of words will depend heavily on your relationship with the boss and the context. Using overly formal language with a close friend might sound odd, and vice-versa.
* Regional Variations: Even within Scottish Gaelic and Irish Gaelic, there are regional variations in vocabulary and pronunciation.
Ultimately, the best way to express "great boss" in Gaelic would be to choose the words that best convey your respect and appreciation within the specific context. A native speaker would be best equipped to help you choose the most natural and appropriate phrase.