She muttered resentfully to herself, compromising between bile and naval propriety by cursing too softly for anyone else to hear. What the hell was Harrington's problem?!
I would imagine that most sailors learn to juggle bile.
An aside:
When I was a snotty nosed kid (yesterday) 'cursing' was what a wicked witch did to you, and 'cussing' represented the four-letter words that your mother threatened to wash out of your mouth with soap. Now they are used interchangeably, and it is odd to me.