谙 諳 an1
to be versed in; to know well

strokes 16
radical
讠
言
strokes after radical 9
谙练 諳練 an1 lian4
conversant; skilled; proficient

不谙世故 不諳世故 bu4 an1 shi4 gu4
unworldly; unsophisticated

熟谙 熟諳 shu2 an1
to know sth fluently; well-versed