able
able は五感（目・耳・鼻・舌・皮膚）の身体能力を含め、常識的に能力として認められる場合に使われる。adequate と同じ意味に使える capable はもっと複雑な、時には潜在能力を含んだ言葉。誉め言葉にも悪い意味にも使える
able
/ˈeɪbl/
Word Family
able adjective (≠ unable) 1 able to do something (used as a modal verb) having the skill, intelligence, opportunity, etc. needed to do something
You must be able to speak French for this job.
A viral illness left her barely able to walk.
We're still able to get visas to come and go from Thailand.
I didn't feel able to disagree with him.
Will you be able to come?
Are you really willing and able to do what is necessary?
They don't even seem able to see what's good about their ideas.
These families are less able to afford a balanced, healthy diet.
Local farmers were able to make a decent living selling their produce.
Humans are uniquely able to use true language.
I was just able to make out a dark figure in the distance.
Once you've had some sleep you'll feel better able to cope.
She is not physically able to take care of herself.
Unfortunately they weren't able to come.
Collocations
verbs
adverb
2 (comparative abler /ˈeɪblə(r)/ /ˈeɪblər/, superlative ablest /ˈeɪblɪst/ /ˈeɪblɪst/) intelligent; good at something
She's the ablest student in the class.
He was a very able man in business matters.
less able students
She seems very able.
Word Origin
late Middle English (also in the sense ‘easy to use, suitable’): from Old French hable, from Latin habilis ‘handy’, from habere ‘to hold’.