rnortal:

• retard
• insane (depending on context)
• psycho/psychotic (depending on context)
• dumb
• midget 
• cretin
• spastic/spasticated
• lunatic
• lame
• crazy (depending on context)
• bipolar (“omg she’s so bipolar she got mad at me out of nowhere!”)
• ocd (“sorry don’t put ur feet on my pillow I’m so ocd about that!!” using this and bipolar in this type of context is ableist due to it undermining the suffering of others through using the terms in a lighthearted situation when they are serious mental illnesses)
• schizo