Question

iam suspicious _______ his true intention​

Answer 1

Answer:

'about' is the answer to your question.

Answer 2

I am suspicious about/of his true intention.

• The prepositions 'about' and 'of' are used after 'suspicious' to describe someone's motive behind something, it may be in some dishonest activity or any particular crime.
• For the given sentence, it is telling about the suspiciousness or doubtfulness 'of or about ' the exact intention of some person.
• The above sentence reveals that I was being very cautious and careful about 'his true intention'.