Modifiers matching hours:

• unsocial,
• off,
• working,
• regular,
• nonstandard,
• free,
• happy,
• irregular,
• convenient,
• vulnerable,
• nontraditional,
• busy,
• quiet,
• odd,
• social,

Simple categories matching quiet:

• environment,
• area,
• activity,
• car,
• part,
• exercise,
• game,
• toy,
• pet,
• performer,
• weapon,
• thing,
• location,
• practice,
• period,
• operation,
• mind,
• bay,
• object,
• season,
• space,
• experience,
• room,
• day,
• event,
• place,
• time,
• spot,
• sound,
• times,
• hours,
• noise,
• facility,
• work,
• recreation,
• center,
• use,
• water,
• night,
• play,
• animal,
• structure,
• job,
• inactivity,
• stuff,
• works,
• vehicle,
• corner,