1. (a.) Not in the regular, usual, or established form; not according to official, conventional, prescribed, or customary forms or rules; irregular; hence, without ceremony; as, an informal writing, proceeding, or visit.

2. (a.) Deranged in mind; out of one's senses.

Bohemian affable beat beat-up bedraggled blowzy breakaway careless casual chintzy colloquial common conversational cordial degage dilapidated drabbletailed draggled draggletailed easy easygoing en deshabille everyday familiar far out folksy free free and easy fringy frowzy frumpish frumpy garden-variety gracious grubby haymish heretical heterodox hippie homely homey in dishabille in rags irregular kinky loose lumpen maverick messy mussy natural negligent nonstandard not cricket not done not kosher offbeat offhand offhanded ordinary original plain poky private ragged raggedy relaxed ruinous scraggly seedy shabby shoddy simple slack slatternly slipshod sloppy slovenly sluttish sociable sordid special spoken spontaneous sporty squalid substandard tacky tattered unaffected unassuming unauthorized unceremonious unconstrained unconventional uneducated unfashionable unkempt unliterary unneat unofficial unorthodox unpretentious unsightly unstudied untidy vernacular way out