The Swedish term "tvivelaktig, tveksam, betänklig" matches the English term "doubtful"

other swedish words that include "tveksam" : english :
tveksam in doubt
obeslutsam, tveksam, rådlös, rådvill irresolute
other swedish words that include "betänklig" : english :
betänklig, vansklig, osäker precarious