Here's what rhymes with brainstormed.

Consider these alternatives

brainstorm / rainstorm innovated / dated bantered / standard commiserate / state toying / enjoying conceptualize / size collaboratively / creatively warred / called devising / rising commiserated / dated reminisce / this reminiscing / living preconceived / received toyed / avoid optimistically / statistically pessimistically / statistically creatively / qualitatively ruminated / dated