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No, 'awaiting' cannot be used as an adjective, though 'waiting' can be. 'Awaiting' is the present participle of the verb 'await'.
For example:
'He was awaiting the arrival of his aunt.'
Currently Awaiting Certification.
Awaiting the End was created in 1994.
Awaiting Your Reply was created in 1978.
What does awaiting remittal means