Wild, frenzied, or extremely intense in a crazy or unhinged way, like someone acting without self-control.
From 'maniac' (person in a frenzy) plus '-al' (adjective suffix), from Greek 'mania' (madness, frenzy), related to 'manic' but with a more dramatic, theatrical quality.
Maniacal carries a theatrical edge that 'manic' doesn't—it suggests not just frenzy but DRAMATIC frenzy, which is why villains have 'maniacal laughs' rather than just regular laughs!
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