The Swedish term "lättsinnig, ostadig, flyktig person" matches the English term "fickle"

other swedish words that include "ostadig" : english :
drucken, ostadig groggy
ostadig unstable
ostadigt unsteadily
ostadig unsteady
ostadig wonky
other swedish words that include "flyktig" : english :
flyktig cursory
flyktig fleeting
flyktig flighty
flyktig voiatile
flyktig volatile