Modifiers matching radiation:

• neutral,
• harmful,
• visible,
• solar,
• electromagnetic,
• light,
• invisible,
• intense,
• external,
• overhead,
• incident,
• off,
• magnetic,
• natural,
• exciting,
• nuclear,
• mechanical,
• extraneous,
• unnecessary,
• monochromatic,
• common,
• thermal,
• special,
• energetic,
• penetrating,
• continuous,
• optical,

Simple categories matching unnecessary:

• toy,
• treatment,
• procedure,
• service,
• intervention,
• radiation,
• medication,
• misconception,
• surgery,
• thing,
• test,
• measure,
• stuff,
• activity,
• practice,
• expense,
• task,
• therapy,
• information,
• interference,
• exertion,