highly /ˈhaɪli/adverb 2forms 4phrases 1 adverb2 •extremely, or very muchHe is in a highly visible job.The book was highly controversial yet sold unbelievably well. •In a high or esteemed manner.He spoke highly of you.Highly placed officials who denied the story formshighlier · more highly · highliest · most highly Phrases with highly think highly ofTo admire or esteem something for its positive qualities.