Relatively great in extent from one surface to the opposite, usually in the smallest solid dimension; not thin, Heavy in form, build, or stature; thickset, Informal Going beyond what is tolerable; excessive, adverb_ In a thick manner; deeply or heavily, In a close, compact state or arrangement; densely, So as to be thick; thickly, noun_ The thickest part, The time when anything is thickest, verb_ rare To thicken