[i] (prt) (fam) (See かい, ぞい, だい, わい) strengthens a question, assertion, etc. #26
[e] (int) (1) eh? (surprise); (2) eh (agreement); (prt) (3) (arch) (See かえ, ぞえ, わえ) strengthens a question, assertion, etc.; (4) (after a noun) used when calling out to someone #611
[mou] (adv, int) (1) (See すでに) already; anymore; (2) soon; shortly; (3) more; further; other; again; (int, adv) (4) interjection used to strengthen expression of an emotion (often exasperation); (P) #1524
[ike ; ikke] (pref) (See いけ好かない) prefix used to strengthen a derogatory adjective #1842
[きょうか, kyouka] (n, vs) strengthen; intensify; reinforce; solidify; enhancement; (P) #1915
[dai] (prt) (1) (fam) marks wh-question (what, where, who); (2) (chn) strengthens one's judgment or conclusion; (P) #2679
[のばす, nobasu] (v5s, vt) (1) (esp. 伸ばす) to grow long (beard, hair, etc.); (2) to lengthen; to extend; to stretch; (3) (esp. 伸ばす) to reach out; to hold out; (4) to straighten; to smooth out; (5) to spread evenly (dough, cream, etc.); (6) to dilute; to thin out; (7) (esp. 延ばす) to postpone; (8) to prolong; (9) to strengthen; to develop; to expand; (P) #18016
[げんに, genni] (adv, vs) strictly; severely; rigidly; fortify; strengthen; secure #19879
[ひっ, hitsu] (pref) (from 引き) (See 引っ抱える) goes before a verb to strengthen its meaning or to add emphasis
[あめふってじかたまる, amefuttejikatamaru] (exp) (id) adversity strengthens the foundations