Modifiers matching stimulant:

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

Simple categories matching unnatural:

• condition,
• event,
• cause,
• color,
• object,
• chemical,
• drug,
• disturbance,
• food,
• death,
• force,
• stimulant,
• substance,
• component,
• danger,
• drink,
• substrate,
• action,
• surface,
• shade,
• catastrophe,
• variation,
• compound,