thoughtful (adj.)

• accommodating
• accommodative
• affable
• agreeable
• analytical
• attentive
• brainy
• brooding
• calculating
• careful
• caring
• cautious
• charitable
• circumspect
• civil
• cogitative
• cognitive
• compassionate
• complaisant
• conceptive
• conceptual
• considerate
• contemplative
• courteous
• curious
• decorous
• deep
• deferential
• deliberative
• delicate
• demure
• discreet
• discriminating
• discriminative
• earnest
• engrossed
• enlightened
• fair
• formal
• frowning
• graceful
• gracious
• grave
• grim
• heedful
• helpful
• indulgent
• intellectual
• introspective
• judicial
• judicious
• kind
• kindly
• lenient
• logical
• long-faced
• loving
• meditative
• melancholy
• mental
• mindful
• musing
• noetic
• obliging
• pensive
• polite
• politic
• pondering
• prehensive
• provident
• prudent
• prudential
• rapt
• rational
• reflecting
• reflective
• regardful
• respectful
• ruminant
• ruminative
• sedate
• serious
• sober
• sobersided
• solemn
• solicitous
• somber
• speculative
• staid
• studious
• sympathetic
• tactful
• tender
• thinking
• thought
• tolerant
• unsmiling
• unthoughtful
• urbane
• wary
• weighty
• well-advised
• wistful