Debilitated creatures have disadvantage to attack rolls.
Poisoned creatures have disadvantage to all actions until they take a long rest or regain any number of hits points.
Constrained creatures cannot take actions but are still aware of thier surroundings.
Prone creatures are the one that find themselves on lying on the ground, their next move or jump action cost 2 more action points.
Diseased creature have a -2 to all thier attributes until they take a long rest or are healed.
Blind creatures cannot see, as such cannot use any ability or spell that rely on sight.
Cursed creatures uses a d8 instead of a d10 for skill checks, saving throws and attack rolls.
Stunned creatures cannot take actions or reactions until the effect ends.
Grappled creatures are unable to use the move or jump actions unless they succeed in a contested Strength check against the grappler.
Rooted creatures cannot use the move or jump action.