instant (n.)
- acute
 - alert
 - approaching
 - being
 - bit
 - breath
 - breathing
 - brewing
 - burning
 - close
 - coming
 - contemporary
 - coup
 - crack
 - crying
 - current
 - day
 - earnest
 - extant
 - flash
 - flying
 - future
 - gathering
 - grasping
 - hour
 - imperative
 - interval
 - jiffy
 - juncture
 - latest
 - little
 - looming
 - loud
 - lowering
 - microsecond
 - millisecond
 - minute
 - modern
 - moment
 - new
 - passing
 - period
 - point
 - present
 - pressing
 - prompt
 - quick
 - ready
 - ready-made
 - running
 - season
 - sec
 - second
 - shake
 - snap
 - space
 - span
 - spell
 - spurt
 - stage
 - stretch
 - stroke
 - summary
 - swift
 - tick
 - time
 - trice
 - twinkle
 - twinkling
 - twitch
 - urgent
 - waiting
 - while
 - wink
 
instant (adj.)
- actual
 - acute
 - alert
 - approaching
 - apt
 - bit
 - breathing
 - burning
 - clamant
 - clamorous
 - close
 - coming
 - compelling
 - contemporaneous
 - contemporary
 - crack
 - critical
 - crucial
 - crying
 - current
 - cursory
 - day
 - decisive
 - demanding
 - dire
 - direct
 - draining
 - earnest
 - exacting
 - exigent
 - existent
 - existing
 - exorbitant
 - expeditious
 - extant
 - extortionate
 - feverish
 - flash
 - flying
 - forthcoming
 - fresh
 - furious
 - future
 - gathering
 - grasping
 - hasty
 - high-pressure
 - hurried
 - immanent
 - immediate
 - imminent
 - impendent
 - impending
 - imperative
 - imperious
 - importunate
 - insistent
 - instantaneous
 - last-minute
 - latest
 - little
 - looming
 - loud
 - lowering
 - menacing
 - minute
 - modern
 - moment
 - momentaneous
 - momentary
 - near
 - new
 - overnight
 - passing
 - persistent
 - pertinacious
 - pivotal
 - point
 - prepared
 - present
 - present-day
 - pressing
 - presto
 - prompt
 - punctual
 - quick
 - ready
 - ready-made
 - running
 - sec
 - second
 - slapdash
 - span
 - speedy
 - stage
 - stretch
 - summary
 - superficial
 - swift
 - taxing
 - threatening
 - tick
 - time
 - topical
 - twinkling
 - up-to-date
 - up-to-the-minute
 - upcoming
 - urgent
 - waiting
 - while
 
Lord, Lord, how this world is given to lying! I grant you I was down and out of breath; and so was he. But we rose both at an instant, and fought a long hour by Shrewsbury clock.