1. superlative form of bass; lowest in pitch or frequency of sound
Usage: music/acoustics
2. superlative form of base; of the lowest quality, rank, or moral character
Usage: formal or literary

Examples

• The bassest notes of the organ resonated through the cathedral.
• His bassest instincts drove him to act without thinking.
• The bassest form of flattery is insincere praise.
• That speaker produces the bassest sound I've ever heard from a compact device.
• She refused to stoop to the bassest level of gossip.
• The bassest frequencies in the mix were overwhelming the other instruments.