The opposition Congress-led UDF disrupted proceedings on the first day of the state Assembly itself, demanding Mani's resignation, leading to early adjournment of the House for the day.
They said Mani's alleged offensive language was a "disgrace" to the state and was an offence under Section 294 of the IPC which attracts a sentence of 3 months imprisonment.
Vijayan said Mani, who hails from Idukki district, had used colloquial language while addressing a function which was "distorted and 'magnified" by the media.
Protests had erupted in various parts of Kerala, demanding the minister's resignation over his alleged remarks against 'Pembila Orumai' activists and IAS officers involved in the eviction drive from encroached lands in Munnar in Idukki.
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"Mani himself had offered an explanation and expressed regret and so there is no need for a debate," the chief minister said, replying to a notice seeking adjournment motion by the United Democratic Front (UDF) on the controversy connected with the eviction drive in Munnar and Mani's remarks.
Mani in his reply maintained that he had not used any offencive language against women.
When asked by the Opposition leader in the state Assembly Ramesh Chennithala why he had expressed regret, Mani, however, remained silent.
Speaker P Sreeramakrishnan took up other business scheduled for the day and adjourned the House as opposition MLAs protested, holding a black banner, demanding that Mani be ousted.
The Opposition also protested during the Question Hour on the same issue.