#安 is made of #うかんむり and 女 (female). うかんむり is associated with a house – “having a woman in the house” makes it peaceful, which makes perfect sense to me, though feminists may argue.
不安（フアン）（な）: ill at ease, unsettling
安（やす）い: cheap, inexpensive
安宿（やすやど）: cheap lodging house
安達（あだち）: Adachi – a common surname
安（いずく）んぞ: (old) how, why
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