[Japanese variant] formerly「flow, fluids」with「cease movement, foot-dis-integrating」three times (澁) meaning「absolutely stop, stumbling」and before that「flow, cut and halt movement (doubled: 澀)」representing the painful process occurring twice, once with each foot. Bottom two「cease movement, foot-dis-integrating」elements were replaced by「dry stickiness, emissions in all directions」(without the inside「stream」element) and resembling「puckered」as perhaps a mouth or an anus. One's anus may be puckered after a bout of terror-induced diarrhea in order to hold back the loose stools and drippings (such as when spontaneously defecating prior to or during the foot-dis-integrating procedure), and an ASTRINGENT is often effective for stanching the unwanted discharge, as in「stop, stop, stop that flow!.」Astringents also cause your lips to pucker naturally, and cause a「dry sticky」mouth.
　TAN-colored is derived either from the color of diluted feces in diarrhea, or, the color of a loincloth so permanently stained, or, perhaps the color of unripe persimmons having the same astringent taste being described by this glyph, and unripe persimmons are used to stop diarrhea, with tannins.
　You can guess yourself why the associated meaning of TARDY applies, as in a person may have been delayed by a messy bowel movement or two, or three for that matter. HESITANT, RELUCTANT is also obvious, as one doesn't normally jump with both feet into anything when nursing a severe case of the runs, nor to eat anything known to be an ASTRINGENT, not to mention reluctance for having one's feet bones mashed, one foot at a time.
　Meaning of REFINED TASTE or REFINEMENT probably is associated with being「tight-assed with stiff upper lip, orally and rectally puckered all the time, anal retentive」without relief or relaxation. It has been suggested as well that there is an association at times between the REFINED TASTES of rich foods and loose stools, cause one to keep one's anus puckered to avoid an accidental discharge or inappropriate flatulence with loose stool, a cause of regret.

Modern definitions (that generally disregard history) …excluding politically incorrect concepts and other meanings deemed offensive today; may list only pigeonholed definitions, euphemisms, or meaningless mnemonics)
Chinese: Japanese variant of 澀|涩
Japanese: astringent juice, bitter, puckery, rough, harsh, tart, austere, elegant, refined, quiet, sober, sombre, subdued, tasteful, understated, sour, glum, grim, sullen, sulky, stingy, tight-fisted, to hesitate, to hold back, to balk, to falter, to be reluctant, to be unwilling, to begrudge, to have loose painful bowel movement, to suffer from tenesmus, reluctantly, unwillingly
Unihan extended: astringent; harsh; uneven, rough
EDRDG: astringent; hesitate; reluctant; have diarrhea