noun which may take the genitive case particle 'no', noun
conventional; commonplace; trite; hackneyed
Describes something that is overused, lacking originality, or stereotypical. Often used in set phrases like 常套手段 (conventional method) or 常套句 (cliché).
彼の返事は常套句ばかりで、誠意が感じられなかった。
His reply was full of clichés and didn't feel sincere.
それは
That's a conventional tactic of politicians.
ありきたり is more casual and means 'ordinary' or 'run-of-the-mill', while 常套 is more formal and emphasizes being stereotypical or hackneyed, often in set phrases.
陳腐 means 'stale' or 'trite' and carries a stronger negative nuance of being outdated and worn-out, whereas 常套 focuses on being conventional and overused.
Compound of 常 (usual, ordinary) and 套 (conventional, set pattern). The kanji 套 is relatively rare and often replaced by kana in modern writing.