Synonyms for Closely:

adv

amiably (adverb)
intimately, like-mindedly, companionably, sociably, amicably, amiably, chummily, congenially, affectionately, warmheartedly.
nearly (adverb)
approximately, immediately, Adjacently, nearly, locally.
rigidly (adverb)
strictly.
similarly (adverb)
analogously, interchangeably, Indistinguishably, uniformly, similarly.
with determination (adverb)
hard.

adv.

amiably (adverb)
intimately, like-mindedly, companionably, sociably, amicably, amiably, chummily, congenially, affectionately, warmheartedly.
approximately, carefully (adverb)
jointly, strictly, nearly, minutely, hard, firmly, similarly, intimately, exactly, in conjunction with.
nearly (adverb)
approximately, immediately, Adjacently, nearly, locally.
similarly (adverb)
analogously, interchangeably, Indistinguishably, uniformly, similarly.
together (adverb)
jointly.

n.

alongside, united, attached, Beside, next to, next door. indistinguishable, sort of, nearby, like, hard, comparable, similar, homogeneous, alike, not unlike. gently, deliberately, jealously, critically, with a critical eye, cautiously, minutely, studiously, thoroughly. one-on-one, paralinguistic, verbal, person-to-person, interactive, expressive, one-to-one, nonverbal, communicative, illocutionary. approximately (noun)
exactly, firmly, in conjunction with, strictly, jointly.
closely (noun)
nearly, tight, intimately, close.

Other synonyms:

jealously, cautiously, minutely. studiously, deliberately, thoroughly. gently, critically, nearby. Other relevant words:
indistinguishable, person-to-person, like, attached, one-to-one, gently, close, similar, paralinguistic, Beside, united, hard, deliberately, homogeneous, jealously, nearby, communicative, thoroughly, illocutionary, exactly, nonverbal, jointly, critically, comparable, alongside, verbal, minutely, tight, studiously, strictly, alike, expressive, cautiously, firmly, interactive, one-on-one.

Usage examples for closely

  1. I stared at him closely as I shook my head in answer to that question. – The Prairie Mother by Arthur Stringer
  2. They were closely watched, but it was impossible to watch them so closely as to prevent them from doing that which hurried them to the grave. – Life and Work in Benares and Kumaon, 1839-1877 by James Kennedy