inexperienced
unfelt
untasted
untried
ill-prepared
much-neglected
possest
unattempted
uncollected
unconquered
unconsidered
uncurious
undescribed
undreamed-of
unguessed
unguessed-at
unimagined
unreached
unrealised
unrecognised
unrecognized
unreported
unsubsidized
unthought-of
untravelled