large or extensive in breadth or importance or comprehensiveness; "the might have repercussions of unimaginable largeness"; "the very extensiveness of his power was a temptation to abuse it"
in a high position or level or rank; "details known by only a few highly placed persons"
to a high degree or extent; favorably or with much respect; "highly successful"; "He spoke highly of her"; "does not think highly of his writing"; "extremely interesting"