We call it 'mindless' without ever once attempting to interpret its signals, and when we see unambiguous signs of purposeful activity, we simply fail to integrate it.

According to Kovatchev, the initiative is an unambiguous sign that the federal project is the only way toward for Europe.

They say that the new photographs, taken in 1998 and with a resolution 5 to 10 times as great as those of the Viking missions, show no unambiguous signs of ancient seas.

Tolokonnikova stated that "Our imprisonment serves as a clear and unambiguous sign that freedom is being taken away from the entire country."

BUT again rhythm and pattern alone cannot be taken as unambiguous signs of life.

Three chimes, though, meant that the scout probes had detected unambiguous signs of life.

Three chimes, though, meant that the scout probes had detected unambiguous signs of life-and that was reason enough for jubilation.

In the 1960's and 1970's, too, a wariness of organized religion became intellectually fashionable and unambiguous signs of religion were out of vogue.

The previous Viking landers conducted biological tests, which failed to detect any unambiguous signs of life.

Samples that the landers took of the Martian soil underwent a battery of tests but showed no unambiguous signs of life.