bathos
Concise Oxford English Dictionary © 2008 Oxford University Press:
bathos /ˈbeɪθɒs/
▶noun (in literature) an unintentional change in mood from the important and serious to the trivial or ridiculous.
– derivatives
bathetic /bəˈθɛtɪk/ adjective.
bathetic /bəˈθɛtɪk/ adjective.
– origin C17: from Gk, lit. ‘depth’.
'bathos' also found in these Oxford entries:

