/ ˈhaɪli; NAmE / adverb
1.
very :
highly successful / skilled / intelligent
highly competitive / critical / sensitive
It is highly unlikely that she'll be late.
2.
at or to a high standard, level or amount :
highly trained / educated
a highly paid job
3.
with admiration or praise :
His teachers think very highly of him (= have a very good opinion of him) .
She speaks highly of you .
Her novels are very highly regarded.
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WORD ORIGIN
Old English hēalīce (see high , -ly ).