IPA: /ˈsɛnsləs/
KK: /ˈsɛnsləs/
Lacking meaning or purpose; foolish or unreasonable.
His senseless actions caused a lot of trouble for everyone.
Senseless → It is formed from "sense" (from Latin "sensus", meaning perception or feeling) and "-less" (meaning without). The word "senseless" means without perception or feeling, indicating a lack of awareness or understanding.
Think of 'sense' as perception or feeling, and remember that 'senseless' means lacking that perception or feeling.