1. (a.) Not studied; not acquired by study; unlabored; natural.

2. (a.) Not skilled; unversed; -- followed by in.

3. (a.) Not spent in study.

Bohemian ad-lib affable artless automatic casual caught napping caught off balance caught short colloquial common conversational cordial degage easy easygoing everyday extemporaneous extemporary extempore extemporized familiar folksy free and easy gracious gut haphazard hasty haymish homely homey ill-advised ill-considered ill-devised impromptu improvised inadvertent indeliberate informal ingenuous involuntary irregular loose makeshift naive natural nonstandard offhand offhanded plain precipitate reflex reflexive relaxed rough-and-ready simple snap sociable spoken spontaneous spur-of-the-moment substandard surprised taken aback taken by surprise taken unawares tripped up unadvised unaffected unarranged unartificial unassuming unbegun uncalculated unceremonious unconcocted unconscious unconsidered unconstrained uncontrived unconventional undeliberate undeliberated undesigned undevised uneducated unexamined unexplored unhatched unintended unintentional unliterary unmade unmanufactured unmeditated unofficial unorganized unplanned unpremeditated unprepared unprimed unready unrehearsed unscanned unschooled unsearched unsifted unsophisticated untutored unweighed unwilled vernacular