Speaking one's mind is the act of expressing one's thoughts and opinions openly and honestly. This term can be broken down into two crossword solutions: VOCAL (5 letters) and THINKINGOUTLOUD (15 letters). VOCAL is an adjective that means expressed or done with the voice, while THINKINGOUTLOUD is an idiom that means to express one's thoughts aloud without any filter. Together, these two words describe the act of speaking one's mind.