infrequent
adjective uk/ɪnˈfriː.kwənt/ us/ɪnˈfriː.kwənt/
很少发生的,罕见的
not happening very often
His letters became infrequent, then stopped completely. 他的信来得少了,之后干脆彻底不来了。
Synonym: rare (NOT COMMON)
Opposite: frequent
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