How to say "activism" in Japanese

• 積極行動主義せっきょくこうどうしゅぎ
  nounCovers activism with the proactive emphasis its opening element 積極 ('positive, active') makes explicit. It is less common, and fits contexts where assertive, hands-on engagement is the point.
• アクティビズム
  nounA katakana loanword taken directly from English 'activism', so it tracks the English term's meaning closely. It is less common, and its katakana shape signals the borrowed origin at a glance.
• 行動主義こうどうしゅぎ
  no-adjectiveLiterally 'action-ism': activism understood as a doctrine of taking action rather than merely holding views. In psychology it means behaviorism, so context determines which sense applies. It is less common.

All three render 'activism' and are less common: 積極行動主義 foregrounds proactive action, 「アクティビズム」 is the direct loanword, and 行動主義, literally 'action-ism', also means behaviorism in psychology.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

• 積極行動主義せっきょくこうどうしゅぎactivism
• アクティビズムactivism
• 行動主義こうどうしゅぎactivism