彼は考えがかたい。

he; him; his; boyfriend

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

thinking; thought; view; opinion; concept; idea; notion; imagination; intention; plan; design; consideration; judgement; deliberation; reflection; wish; hope; expectation

indicates sentence subject (occasionally object); indicates possessive (esp. in literary expressions); but; however; still; and

difficult; hard