あいつは手強い相手だ。
Sentence Analyzer
English Translation
He is a formidable opponent.
Furigana
あいつは手強 い相手 だ。
Romanji
Aitsu wa tezuyoi aite da.
Words
彼奴
(あいつ、きゃつ、かやつ、あやつ)
he; she; that guy
は
(は)
topic marker particle; indicates contrast with another option (stated or unstated); adds emphasis
手強い
(てづよい)
strong; resolute; firm; strict
相手
(あいて)
companion; partner; company; other party; addressee; opponent (sports, etc.)
だ
(だ)
be; is; indicates past or completed action; indicates light imperative