uncomplaining (adj.)

• abject
• accepting
• accommodating
• acquiescent
• adaptive
• agreeable
• amenable
• comfortable
• complaisant
• compliant
• composed
• consenting
• content
• contented
• easy
• easygoing
• euphoric
• happy
• humble
• meek
• nonresistant
• obedient
• passive
• pleased
• reconciled
• satisfied
• servile
• submissive
• subservient
• supine
• unassertive
• unresistant
• unresisting