Here are some examples of how to use "complacent" in sentences:
* Adjective: "The company became complacent after years of success, failing to adapt to the changing market."
* Noun (rare): You can use "complacency" as a noun, which refers to the state of being complacent. "Their complacency led to their downfall."
Here's why you can't directly use "complacent" as other parts of speech:
* Verb: There's no verb form of "complacent." You would use verbs like "become complacent," "remain complacent," or "grow complacent."
* Adverb: You wouldn't use "complacent" as an adverb. Instead, you could use adverbs like "complacently" or "complacently," which modify verbs or adjectives.
In summary: While "complacent" is an adjective, you can use related words like "complacency" (noun) or "complacently" (adverb) to express similar meanings in different parts of speech.