at first glance/sight

at first glance

Upon first seeing or considering something. At first glance, I thought the house was great, but the inspector's list of problems changed my opinion. The contract did seem favorable at first glance, but I can see now that it would not have been beneficial.
See also: first, glance

at first sight

The first time one sees another person or thing. When I met my wife, it was love at first sight. At first sight, I knew that house was perfect for me.
See also: first, sight
Farlex Dictionary of Idioms.

at first glance

 and at first blush
when first examined; at an early stage. At first glance, the problem appeared quite simple. Later we learned just how complex it really was. He appeared quite healthy at first glance. At first blush, she appeared to be quite old.
See also: first, glance
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.

at first glance

COMMON You say at first glance when you are describing your first opinion of someone or something, especially when this opinion is wrong or incomplete. At first glance, the room looked tidy and ordered. He had a round face that, at first glance, made him look boyish, though closer inspection revealed a man in early middle age. Compare with at first sight.
See also: first, glance

at first sight

COMMON You say at first sight to describe your first impression of someone or something. The problem is trickier than it looks at first sight. The aims of the committee appear at first sight to be admirable. Nothing is ever quite as good or quite as bad as it looks at first sight. Note: You usually use this expression to suggest that this first impression was wrong or incomplete. Compare with at first glance.
See also: first, sight
Collins COBUILD Idioms Dictionary, 3rd ed.

at first ˈglance/ˈsight

as things seem at first; judging by first appearances: At first glance, the exam paper looked fairly difficult, but once I got started I found it quite easy.
See also: first, glance, sight
Farlex Partner Idioms Dictionary

at first glance

On initial consideration: At first glance the plan seemed unworkable.
See also: first, glance
American Heritage® Dictionary of the English Language, Fifth Edition.
See also:
  • at first glance
  • blush
  • first blush, at
  • at first blush
  • glance
  • be first out of the box
  • first in, best dressed
  • first refusal
  • refusal
  • give (someone) the first crack at (something)