しかも details
Examples
and what's more — a further fact the speaker presents as going beyond what the first point alone would lead you to expect
この店、安いんだよ。しかも、量もすごく多いんだ。
kono mise, yasui n da yo. shikamo, ryou mo sugoku ooi n da.
This place is cheap, you know. And what's more, the portions are huge. casual
彼は約束の時間に一時間も遅れてきた。しかも、謝りもしなかった。
kare wa yakusoku no jikan ni ichijikan mo okurete kita. shikamo, ayamari mo shinakatta.
He turned up a full hour late. And on top of that, he didn't even apologise. neutral
新しい機種は従来より軽くなりました。しかも、価格は据え置きとなっております。
atarashii kishu wa juurai yori karuku narimashita. shikamo, kakaku wa sueoki to natte orimasu.
The new model is lighter than its predecessor. And the price, moreover, remains unchanged. formal
Formation
しかも、clauseattaches to plain clause
Related patterns
Similar
それに adds a second point of the same weight and leaves the reader to rank it; しかも stamps its addition as noteworthy in its own right, so a flat two-item list takes それに while 安い。しかも、うまい is a recommendation being pressed.
さらに counts the next step in a series and belongs to written and formal-spoken register; しかも carries the speaker's own verdict that the extra fact is remarkable, and it is at home in conversation — which is why a procedure list takes さらに and a complaint or a sales pitch takes しかも.
しかも stamps the second fact as noteworthy in its own right and will follow with a bare fragment (三時間待った。しかも、外で); その上 reports that the circumstances have accumulated and wants a clause with weight of its own after it, so ?その上、外で does not stand — both praise and complain equally well, and the fragment is what separates them.
しかも may bring in a wholly separate fact (遅れた。しかも、謝りもしなかった) as readily as it sharpens the one just stated; それも can only do the second, so it cannot stand where しかも's addition is not a specification of what came before — 謝らなかった is no detail of 遅れた.
Lookalikes
One kana apart and opposite in direction — しかし turns the sentence against what came before, while しかも drives it further the same way; 遅れた。しかも、謝らなかった piles on a second failing, and しかし there would set the two against each other, as though not apologising somehow answered the lateness.