DictionaryRoot: -mest
Old English
-mest
superlative degree
1 / 1

adjective / noun
utmost
UT-mohst/ˈʌtməʊst/
The greatest possible degree, amount, or effort.
Etymology
“Out” with a superlative ending originally described the farthest point or outermost limit. That spatial limit became a limit of degree: the greatest possible amount or importance.