massive and compact
masterly and convincing
materialistic and sordid
maternal and filial
maudlin and grotesque [maudlin = tearfully sentimental]
maxims and morals
meager and bare
mean and debasing
meaning and significance
means and materials
mechanical and monotonous
meddling and muddling
meditative and sympathetic
meek and manageable
melody and softness
memorable and glorious
menace and superciliousness [superciliousness = haughty disdain]
merciful and chivalrous
merciless and unpitying
merit and virtue
mighty and majestic
mild and virtuous
mince and temporize
minds and memories
minuteness and fidelity
mirth and joviality
misdemeanors and improprieties
misery and degradation
misrepresented and reviled
misty and indefinite
mobile and expressive
mockery and imposture
moderate and cautious
modes and methods
modest and retiring
molding and upbuilding
momentary and languid [languid = lacking energy; weak]
momentous and appalling
monopoly and injustice
monotony and indecorum
monstrous and insupportable
moody and brooding
moral and religious
morbid and irritable
motionless and commanding
motives and aims
mud and mire
muddled and incoherent
murmurs and reproaches
muscularity and morality