Modifiers matching stimulant:

• unhealthy,
• powerful,
• serious,
• manufactured,
• synthetic,
• illegal,
• recreational,
• potent,
• popular,
• addictive,
• common,
• strong,
• psychoactive,
• simple,
• sexual,
• illicit,
• medical,
• destructive,
• nervous,
• natural,
• artificial,
• mild,
• harsh,
• major,
• active,
• dangerous,
• bitter,
• chemical,
• controversial,
• psychomotor,
• cardiac,
• immune,
• sympathomimetic,
• legal,
• toxic,
• physical,
• controlled,
• exogenous,
• harmful,
• prescribed,
• pharmacologic,
• regular,
• familiar,
• herbal,
• harder,
• traditional,
• biological,
• unnatural,
• pharmaceutical,
• inert,
• soft,
• ventilatory,
• pharmacological,
• cardiovascular,

Simple categories matching nervous:

• sign,
• strain,
• depressant,
• disorder,
• system,
• reflex,
• disturbance,
• suppressant,
• condition,
• activity,
• excitation,
• lesion,
• disposition,
• tissue,
• movement,
• organisation,
• problem,
• processing,
• symptom,
• tension,
• stimulant,
• change,
• affection,
• area,
• illness,
• disease,
• syndrome,
• complaint,
• drug,
• action,
• injury,
• ailment,
• commotion,
• structure,
• state,
• behaviour,