確実

• (Tokyo) かくじつ [kàkújítsú] (Heiban – [0])[1]
• IPA^(key): [ka̠kɯ̟ᵝʑit͡sɨᵝ]

確(かく)実(じつ) • (kakujitsu) -na (adnominal 確(かく)実(じつ)な (kakujitsu na), adverbial 確(かく)実(じつ)に (kakujitsu ni))

1. certain, reliable

   この人(ひと)に順(したが)えば確実(かくじつ)だ。

   Kono hito ni shitagaeba kakujitsu da.

   He is a reliable fellow.

2. inevitable, necessary

   外(がい)務(む)大(だい)臣(じん)の辞(じ)任(にん)は確実(かくじつ)だ。

   Gaimu daijin no jinin wa kakujitsu da.

   The resignation of the foreign minister is inevitable.

Used particularly of sources of information (“trustworthiness”), rather than for physical activities, such as bus services, for which 確か (tashika) is used instead.

• (reliable): 確か (tashika), 当てになる (ate ni naru)
• (inevitable): 必至 (hisshi), 必然的 (hitsuzen-teki), 不可避 (fukahi)

• (antonym(s) of “reliable”): 不確実 (fukakujitsu), 当てにならない (ate ni naranai)
• (antonym(s) of “inevitable”): 不可能 (fukanō), 可能 (kanō), 偶発的 (gūhatsu-teki)

確(かく)実(じつ) • (kakujitsu) 

1. certainty, reliability
2. inevitability, necessity
3. soundness

• (reliability): 信頼性 (shinraisei)
• (inevitability): 必至 (hisshi), 必然 (hitsuzen), 不可避 (fukahi)

• (antonym(s) of “reliability”): 不確実 (fukakujitsu)
• (antonym(s) of “inevitability”): 不可能 (fukanō), 可能 (kanō), 偶然 (gūzen)