It's correct as far as it goes: it's a complete and correct noun phrase. It's not a complete sentence, however, because it's missing (at least) a verb.
Not in English, no. Perhaps you mean 'disingenuous' which is a word which means not candid or sincere.
Antonyms for sincere include:deceitfuldishonestdisingenuousinsincerelyingtrickytwo-faceduntrustworthy
The correct spelling is 'sincere'.
The way you have it spelled in your question is as good as any - it's not really a word. Sincere is a word who's comparative and superlative are : more sincere, most sincere.
No one believed that he sincerely cared about his job.I sincerely considered every consequence of my actions.
"With sincere appreciation" is the correct phrase. It indicates that the appreciation is accompanied by sincerity.
הכרת תודה (pronounced hah-kah-RAHT toh-DAH).
One can effectively express appreciation in words by being specific about what they are thankful for, using sincere language, and acknowledging the impact the person or action has had on them.
"Sentido" in English can be translated as "meaning" or "sense."
To effectively express gratitude and appreciation in an acknowledgement, be specific about what you are thankful for, mention the person or people you are acknowledging, and use a sincere and heartfelt tone in your writing.
You may say 'seijitsu.'
To write an acknowledgement for a poster, simply thank individuals or organizations who have contributed to the project, such as advisors, collaborators, or funders. Be sure to be specific and sincere in your appreciation.
Not in English, no. Perhaps you mean 'disingenuous' which is a word which means not candid or sincere.
more sincere (sincerer), the most sincere (sincerest)
When writing a letter to an author to express appreciation for their work, be specific about what you enjoyed in their writing, mention how their work impacted you personally, keep your tone respectful and sincere, and consider sharing any personal connections or experiences related to their work.
I'm very sorry , but this makes no sense to me whatsoever , but if you meant Author Andrew Carnegie, he passed away many years ago.
An acknowledgement should be brief and to the point. It should express gratitude and recognition without being overly long or detailed. Aim for a few sentences that convey sincere appreciation.