unceremonious (adj.)

• affable
• casual
• cordial
• degage
• easy
• easygoing
• familiar
• folksy
• gracious
• homely
• homey
• inconsiderate
• informal
• irregular
• loose
• natural
• offhand
• offhanded
• plain
• relaxed
• sharp
• simple
• sociable
• thoughtless
• unaffected
• unassuming
• unconstrained
• unconventional
• ungracious
• unofficial
• unstudied