The official, whose name was deleted in the confidential cable, made the comments when contrasting New Delhi's reaction to the Mumbai attacks to its response after the bombing of India's embassy in Kabul in July 2008.
The cable, dated December 1, 2008 and signed by then US envoy David C. Mulford, spoke of strong demands in the Indian media for retaliatory action against terror camps in Pakistan after Mumbai.
It quoted the Pakistani official as saying the Indian government's reaction to the embassy bombing was "impulsive and politically motivated" when it swiftly blamed Pakistan's intelligence agency, Inter-Services Intelligence.
More than 40 people, including India's military attaché and a diplomat, were killed in the July 2008 attack on the embassy in Kabul, while 166 people died in the Mumbai attacks by gunmen in November 2008.
According to the Pakistan officer, the negative effects of the Mumbai attacks on ties between the two countries would "fizzle out over the next few months", the cable said.
The concluding comment on the Mumbai attacks by the US Embassy was: "No Military Confrontation Anticipated".
India is still pressing Pakistan to bring to justice the alleged masterminds of the attacks in which 10 gunmen attacked a host of targets including luxury hotels, a Jewish centre and the train station.
Nine of the gunmen were killed and the sole survivor, Mohammed Ajmal Kasab, was condemned to death by a Mumbai court in May. He is challenging the sentence.
Seven suspects in Pakistan including the alleged mastermind Zakiur Rehman Lakhvi and Lashkar-e-Taiba operative Zarar Shah have been put on trial in the country, but none has yet been convicted.
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