(of the way in which something shakes) in a quivering manner / (of the way in which something shakes) unsteadily / (of the way in which something shakes) unstably / (of the way in which something shakes) in a tottering manner / (of the way in which something shakes) precariously

(of one's will or feelings) hesitant / (of one's will or feelings) indecisive / (of one's will or feelings) wishy-washy / (of one's will or feelings) irresolute / (of one's will or feelings) wavering

athletic field / ground

les grandes ecoles

grand prix

navy serge / dreadnought

birds flying in flocks

flock of birds

group (of plants) / community (of plants) / colony (of plants)

community (of plants) / group (of plants) / colony (of plants)