Fill in the blank spelt word .The new theory was dismissed as ________ by the mainstream scientific community.

Explanation:

The word preposterous is the correct spelling and means completely absurd, illogical, or ridiculous.

In the sentence:
“The new theory was dismissed as ________ by the mainstream scientific community.”
→ It means the theory was considered unreasonable and not acceptable by scientists.

Why other options are incorrect:

• prepostrous ❌ → missing letters, incorrect spelling
• preposturous ❌ → extra “u”, wrong formation
• preposteruos ❌ → incorrect order of letters

Extra Facts:

• Preposterous comes from Latin praeposterus, meaning “reversed or out of order”.
• The word originally described something done in the wrong order, which later evolved to mean absurd or ridiculous.
• It is commonly used in formal and academic English to criticize illogical ideas.

Example Sentence:

• The claim that the earth is flat is preposterous.