Several senior European officials today brushed aside this weekend's remarks on pacifism in Europe by White House security adviser Richard Allen, calling them ill-timed and exaggerated.

Allen suggested in a speech Saturday that increasing pacifist sentiment in European countries could weaken the resolve of the Western alliance against the threat posed by the Soviet Union.

Indicating further a personal wariness of Allen, the officials voiced a preference for Secretary of State Alexander M. Haig Jr., whose approach to Europe's difficult political situation was said to be more informed and sensitive. The Europeans were commenting at a two-day summit meeting here of the European Economic Community.

Bonn government spokesman Kurt Becker said, "We rely on the remarks, assurances and declaration of Alexander Haig, especially the mutual declaration signed by him and West German Foreign Minister [Hans-Dietrich] Genscher."

Preferring to ignore Allen for the moment, some European officials tried to dismiss the White House aide's assessment as a premature judgment. But officials from West Germany and the Netherlands, countries in which pacifist or antinuclear campaigns are gaining strength, were more pointed in their responses.

"It may be true," said one Dutch official, "but psychologically this was not the time to say it. European governments are aware of the problem and have to work with it."