maniacal

UK: /məˈnaɪək^əl/ US: /məˈnaɪəkəl/ ,(mə nī′ə kəl)

WordReference Random House Unabridged Dictionary of American English © 2025

ma•ni•a•cal  (mə nī′ə kəl), adj. 

1. of or pertaining to mania or a maniac.

• maniac + -al¹ 1670–80

ma•ni′a•cal•ly, adv. 

Collins Concise English Dictionary © HarperCollins Publishers::

maniacal / məˈnaɪək^əl/ adjective

1. affected with or characteristic of mania
2. characteristic of or befitting a maniac: maniacal laughter

maˈniacally adverb

WordReference Random House Learner's Dictionary of American English © 2025

ma•ni•ac /ˈmeɪniˌæk/   n. [countable]

1. an insane person; lunatic.
2. a person who is very enthusiastic or overly excited (about something):
   a maniac about neatness.

ma•ni•a•cal /məˈnaɪəkəl/  adj. 
ma•ni•a•cal•ly, adv. 

WordReference Random House Unabridged Dictionary of American English © 2025

ma•ni•ac  (mā′nē ak′), n. 

1. a raving or violently insane person;
   lunatic.
2. any intemperate or overly zealous or enthusiastic person:
   a maniac when it comes to details.

adj. 

3. maniacal.

• Medieval Latin maniacus of, pertaining to madness. See mania, -ac
• 1595–1605