【Cry】 , 【weep】 , 【wail】 , 【keen】 , 【whimper】 , 【blubber】 mean to show one′s grief, pain, or distress by tears and utterances, usually inarticulate utterances.
【Cry】 and 【weep】 (the first the homelier, the second the more formal term) are frequently interchanged.
【Cry】 is more apt to stress the audible lamentation, 【weep】 , the shedding of tears.
【Wail】 usually implies expressing grief without restraint, in mournful and often long-drawn-out cries, moans, and lamentations.
【Keen】 implies the wailing lamentations or dirges of a professional mourner.
【Whimper】 implies low, whining, broken cries (as made by a baby or puppy).
【Blubber】 implies scalding, disfiguring tears and noisy, broken utterances (as of a child who cannot have his way).