quite; very; pretty / considerably; fairly; rather

not easily

slow, sluggish

dull (edge) / dull (sense), stupid

中々: very, quite, considerably, rather, by no means (with negative verb)

very, quite, considerably, rather / by no means (with negative verb)

a Western knife, table knife

be cut off, break, snap, burst, collapse / be cut, be injured, become fissured / break off, be interrupted / cut or sever connection with / run out, expire, terminate

be able to do, be able to finish

Same as above.