Definition of mad keen on
- He's mad keen on golf.
: arising from, indicative of, or marked by mental disorder
: completely unrestrained by reason and judgment : unable to think in a clear or sensible way
: incapable of being explained or accounted for
: a fit or mood of bad temper
: anger, fury
: very, extremely
: intellectually alert : having or characteristic of a quick penetrating mind
: extremely sensitive in perception
: sharply contested
: to make a loud and long cry of sorrow : to lament with a keen
: to make a sound suggestive of a loud cry of sorrow
: to lament, mourn, or complain loudly
: a lamentation for the dead uttered in a loud wailing voice or sometimes in a wordless cry
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