1. Immediately
   "it was love at first sight"
   - at first glance

Encyclopedia: At first sight

• fluorochrome
• fluoroform
• fluoroscope
• fluoroscopy
• fluorosis
• fluorouracil
• fluorspar
• fluosilicate
• fluosilicic acid
• fluoxetine
• fluoxetine hydrocholoride
• fluphenazine
• flurazepam
• flurazepam hydrochloride
• flurbiprofen
• flurry
• flush
• flush down
• flush it
• flush toilet
• flush-seamed
• flushed
• flushless toilet
• fluster
• flustered