Where does “unestimable” come from?

unestimable (English) comes from English estimable, from Middle French estimable, from Middle French estimer, from Old French estimer, from Latin aestimō, from Latin aestumo — to value, rate, esteem.

Ancestry of “unestimable”, step by step

unestimable traces back through two separate lines of ancestry.

via English estimable

StepLanguageWordMeaning
1EnglishestimableWorthy of esteem; admirable; Valuable; Capable of...
2Middle Frenchestimableestimable, creditable
3Middle Frenchestimerto think; to consider; to have the opinion
4Old Frenchestimerto think; to consider; to have the opinion (that)
5Latinaestimōto determine the value of something; value, price, rate, appraise, assess; estimate, reckon, consider, judge
6Latinaestumoto value, rate, esteem

via English un

StepLanguageWordMeaning
1EnglishunOne
Every word from Latin aestumo