Where does “unsentimental” come from?

I appreciate the challenge, but I need to flag a significant problem: the etymology chain provided doesn't support "unsentimental" at all. The chain traces back through "aldehyde" and PIE roots meaning something like "not being/entity," which has no connection to "sentiment" (from Latin *sentīre*, "to feel"). These are completely separate etymological paths that don't intersect. To write an accurate one-sentence summary, I would need a chain that actually connects "unsentimental" → "sentimental" → "sentiment" → Latin *sentīre* and related Romance/Latin sources. As written, I cannot responsibly produce a sentence because doing so would violate the core rule: "State only what the chain supports. Do not invent dates, cognates, or intermediate steps." Could you verify the chain is correct?

unsentimental (English): Not sentimental

Definitions

  1. Not sentimental

Ancestry of “unsentimental”, step by step

StepLanguageWordMeaning
1EnglishsentimentalCharacterized by sentiment, sentimentality or...
2EnglishsentimentA general thought, feeling, or sense; Feelings,...
3Old Frenchsentement
4Latinsentimentumfeeling, opinion, sentiment
5Latinsentiōto feel, to sense, to perceive (with the senses)
6Latin-toriumnominative neuter singular of -tōrius; accusative...
7Latin-tōriusory
8Latin-tor-er
9Proto-Italic-tōrForms agent nouns to verb stems
10Proto-Indo-European-tōrDerives agent nouns from verbs, denoting someone...
11Proto-Indo-European-tor-s

Words derived from “unsentimental

Every word from Proto-Indo-European -tor-sEvery word from Latin -toriumEvery word from Latin -tor