Equivalent of 【一人で】for a multi-person group unit


I am trying to translate the English expression "left to their own
devices"/"left to themselves"/"in a vacuum" into Japanese, and the best I
could come up with would be something involving 「ひとりで」, but I am trying to
describe a group of people who I am treating as a unit (effectively 一族). Is
there any way to say "alone" when talking about a group of people (in this
case 四人), as in "without the influences/presence of an out-group"?




Where ひとりで/1人で works, 4人で also should work. 4人だけで might be better if you want
to indicate 4人 is a small number. A more generic and neutral expression would
be 自分たちだけで, but I'm not sure if this is usable for the sentence you have in
mind. 孤立して or 隔絶して might be even better in certain contexts (e.g., living in
an desert island).

