IPA: //væˈpɪdəti//
KK: /ˈvæpɪdəti/
The quality of being dull, uninteresting, or lacking flavor or excitement.
The vapidity of the conversation made it hard to stay engaged.
Vapidity → It is formed from "vapid" (from Latin "vapidus", meaning flat or insipid) and the suffix "-ity" (meaning the state or quality of). The word "vapidity" refers to the state of being insipid or lacking flavor.
Think of something that is 'flat' or 'insipid' ('vapid') and remember that 'vapidity' means the quality of being dull or lacking in flavor.