chronic (adj.)

• abiding
• accepted
• accustomed
• aged
• ancient
• antique
• confirmed
• constant
• continuing
• customary
• deep-rooted
• deep-seated
• deep-set
• durable
• enduring
• established
• evergreen
• fast
• fixed
• habitual
• hardened
• hardy
• immutable
• implanted
• incorrigible
• ingrained
• inveterate
• irreversible
• lasting
• long-lasting
• long-lived
• long-standing
• long-term
• macrobiotic
• perdurable
• perennial
• permanent
• perpetual
• persistent
• persisting
• remaining
• rooted
• routine
• set
• settled
• stable
• steadfast
• thorough
• tough
• unfading
• vital
• wonted