The word "out-putting" primarily means something that is unpleasant or unattractive. There are several synonyms available that can be used interchangeably depending upon the context, tone, and situation. Some of the most common synonyms for "out-putting" include terms like disgusting, repugnant, repulsive, unpleasant, distasteful, unsightly, unappealing, unfavorable, and offensive. Furthermore, some other related words that one can use in place of "out-putting" include abhorrent, revolting, hateful, and obnoxious. Therefore, depending on the desired tone of the sentence or clarity of the message, one can choose the appropriate synonym for "out-putting" and convey the idea without any confusion or ambiguity.