Definition of erratic in English:


Line breaks: er|rat¦ic
Pronunciation: /ɪˈratɪk


Not even or regular in pattern or movement; unpredictable: her breathing was erratic
More example sentences
  • A wave of hands suddenly rose high in the air as each one moved about in erratic and unpredictable movements, each as unique as the children's personality.
  • Rapid eye movement sleep is characterized by a highly erratic breathing pattern and could not be simulated with current technology.
  • Of course, if that kind of erratic weather pattern appeared during winter, then I guessed that a blizzard would appear.


Back to top  
(also erratic block or boulder) Geology A rock or boulder that differs from the surrounding rock and is believed to have been brought from a distance by glacial action: the source of stone for the whetstones may have been glacial erratics
More example sentences
  • Huge glacial erratics, boulders unlike most of the other rocks in their surroundings, stand in mute testimony to their cross-country transport by advancing ice.
  • In the absence of other sources of building stone, glacial erratics have been extensively used in Finland and northern Poland.
  • The rocks weighed about 40 kg and included two large pieces of unaltered vesicular basalt with many small attached organisms and numerous smaller rocks including a few glacial erratics.


late Middle English: from Old French erratique, from Latin erraticus, from errare 'to stray, err'.



More example sentences
  • She persuaded her estranged husband to make the payments, though he does so erratically.
  • Capitalisation is often omitted or used erratically, except for names.
  • That initial enthusiasm seems to have fallen away now, and the whole system is running slowly and erratically.


More example sentences
  • Is it a degree of erraticism to just fire your defense team, fire your security guards, then new security guards were hired, then they were fired, then a new team brought in.
  • But his brilliance was often offset by his erraticism, and this erraticism infuriated her.
  • Working for Casey was a trial for everybody, partly because of his growing erraticism and partly because of his own rightwing tendencies.

Definition of erratic in: