Modifiers matching stimulant:

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

Simple categories matching unnatural:

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