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utmost

adjective [before noun]
 
 
/ˈʌt.məʊst/ US  /-moʊst/ (formal uttermost, /ˈʌt.ə-/ US  /ˈʌ.t̬ɚ-/)

Definition

C1 used to emphasize how important or serious something is: a matter of the utmost importance The situation needs to be handled with the utmost care.Serious and severeSevere
(Definition of utmost adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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