1. (of rules) stringently enforced
   "hard-and-fast rules"
   - strict

See also: invariable

• heartburning
• hearted
• hearten
• heartening
• heartfelt
• hearth
• hearth money
• hearthrug
• hearthstone
• heartily
• heartiness
• heartland
• heartleaf
• heartleaf arnica
• heartleaf manzanita
• heartless
• heartlessly
• heartlessness
• heartrending
• heartrot
• hearts
• heartsease
• heartseed
• heartsick
• heartsickness