Fill in the blanks with antonyms of words given in the brackets:
1. In the ………….. mind only negative thoughts enter. (sane)
2. ……….. behavior in human beings is intolerable. (rational)
3. A peaceful mind can observe the ………of nature. (ugliness)
4. A positive attitude is always……… (criticized)
5. A true ……………of past and present is desirable. (ignorance)