I am concerned that
A2CEFR level
5/100Rarity: common
TechnicalRegister
A graded-assertiveness opener used to voice a clinical worry clearly at the start of an escalation.
I am concerned that she's septic and will deteriorate without antibiotics soon.
Rarity runs from 0 (a word everyone knows) to 100 (almost never seen outside specialist or literary writing). Level is the word's real difficulty on the CEFR scale, from A1 to C2.
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