ridicule, laziness
慢 centers on a negative mental state of slackness: laziness or a dismissive, ridiculing attitude that comes from not taking things seriously.
慢 combines 忄 (heart/mind) with 曼, which likely contributes the sound and carries a sense of extended or slack. Together they suggest a mental state of laxness or disrespect.
The heart radical 忄 beside 曼 (which looks like a stretched-out net) suggests a heart that is slack and loose—leading to laziness or a mocking, careless attitude.
For マン, imagine a lazy man lounging around, ridiculing everyone: man -> マン, and his slack heart is the source of his laziness.
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endurance; patience; perseverance; bearing (with something)
pride (in one's achievements, possessions, etc.); self-praise; boast
haughty; arrogant; insolent; proud; overbearing
chronic (illness)
negligence; neglect; carelessness; procrastination
self-conceit; pride
haughty; arrogant; proud; stuck-up
slow; sluggish; dull; slack; inactive
(very) patient; persevering
person proud of their voice
enduring something out of pride; putting up with it; grinning and bearing it
bragging of one's misfortune
contempt; insult; offense; offence
haughty; arrogant; overbearing
(arrogance and) insolence
boasting of one's strength
taking pride in one's humility is a form of bragging; he that humbleth himself wishes to be exalted; too much humility is pride
boasting of one's humility
national or local pride; the pride of one's native place
overconfidence; someone who is overconfident