slow to react
- sluggishSlow and inactive
- delayedMade to wait longer
- hesitantSlow to act
- lethargicLacking energy or alertness
- unresponsiveFailing to react or reply
dull · lagging · torpid · drowsy · numb · foggy · groggy · plodding · leaden · thick · dense · obtuse · flat-footed · behind · sleepy · dazed · stunned · frozen
reaction speed
slow to reactlightning-fast
Extremely rapid
instantaneous · immediate · swift · hair-trigger · reactive
alertness/readiness
slow to reactalert
Warning or watchfulness
on the ball · sharp · quick-witted · vigilant · on one's toes
decisiveness
slow to reactquick-thinking
Mentally rapid, resourceful
decisive · unhesitating · quick on the draw · quick off the mark · nimble