このナイフの刃はするどくてよく切れる。

this (something or someone close to the speaker (including the speaker), or ideas expressed by the speaker)

knife

indicates possessive; nominalizes verbs and adjectives; substitutes for "ga" in subordinate phrases; (at sentence-end, falling tone) indicates a confident conclusion; (at sentence-end) indicates emotional emphasis; (at sentence-end, rising tone) indicates question

edge (of a knife or sword)

topic marker particle; indicates contrast with another option (stated or unstated); adds emphasis

sharp (blade); pointed; sharp (pain); stabbing; cutting (remark); stinging; pointed (question or look); screeching (noise); perceptive; keen; quick (mind); astute; shrewd; discerning; nimble; agile; quick

good; excellent; fine; nice; pleasant; agreeable; sufficient (can be used to turn down an offer); ready; prepared; profitable (e.g. deal, business offer, etc.); beneficial; OK

to break; to snap; to be cut; to split; to crack; to be injured; to wear out; to be worn out; to break; to burst; to collapse; to wear off; to stop working; to go dead; to expire (time limit, etc.); to run out; to become due; to run out (of stock, etc.); to be exhausted; to be used up; to be sold out; to be out of; to be broken off (e.g. of a relationship); to break up; to have severed ties; to be cut off; to be disconnected; to cut well; to be sharp; to be sharp-minded; to be keen; to be shrewd; to be quick-witted; to be able; to be short of; to drop under (a certain figure); to beat (e.g. a record time); to dry off; to curve; to veer; to shuffle (cards); to get angry; to snap; to blow one's top; to lose one's temper; to flip; to be able to do completely